Nobumasa is a playable character in Blackmoon Prophecy.
Nobumasa comes to Island Cave seeking to challenge the octopus to a fight, but his path is barred by a dragon. Then a Branch dragoon arrives, who introduces himself as Vahn and offers his help in slaying the monster. Nobumasa agrees, offers his name and the two defeat the beast. In the cave's depths they encounter the octopus Ultros who challenges them to a duel for the Mohadmal gear and he looses the fight. Afterwards Nobumasa asks Vahn if he can join him sensing that can frequently encounters strong opponents in hopes of finding an enemy that will test his limits and the dragoon agrees. The two return to Mohadmal Village and Elina rejoins the party. However the white mage feels down being helpless after the Archareons' attack, but Nobumasa cuts in explaining that there are situations in life a person has no control over and she should get over it, to which Elina reluctantly agrees to. Then group then enters the Pyramid and slays its guardian with the help of Mohadmal gear. Deep within the pyramid the party defeats a monster that guards Cecil's body and retrieves the Mohadmal Key which they use to open the gate at Mohadmal Wall. The group arrives at Palumpu Post where monsters are starting to overtake the place and Vahn volunteers his party to take take care of them. Encountering a mysterious device on Gryphon Mountain that prevents entrance to the mountain cave, the party decides to go to Palumpu to see if someone can help them go pass it. In the town they meet a blue mage girl Ami who is confused about the "green object" that Vahn speaks of and orders him to take her to it. At Gryphon Mountain, Ami reveals that the green orb signifies Quetzalcoatl's return and to dispel the orb they need to offer thunder berries that grow atop Mt. Palumpu which the party goes to fetch. Atop Mt. Palumpu the party meets Dio once again whom they defeat and take a thunder berry. Back at the Gryphon Mountain the party offers a thunder berry and the orb dissapears, allowing them passage. Deep within the mountain they encounter Quetzalcoatl who forces them to battle but looses. Hearing from Vahn that maybe the disturbance caused by recent villainous activities around Crystals results in monsters going mad, Ami decides to join the party in hopes of protecting the Crystals so monsters would calm. In the town of Organa, the party is denied bridge passage by the Elder whose son was kidnapped by a man in armor. Seeing Vahn's armor, he is wary of him and states that if he brings back his son, he will allow them to continue their journey, the only hint he gives is that the bandits took his son to the northwest. Vahn then travels to Mizuda's Refuge via a chocobo and meets an old wizard named Mizuda who tells him of Faluhd Castle where the bandits have likely taken the Elder's son and that he will give him a key to it provided that Vahn will catch his rabits in an alotted time. The dragoon succeeds in catching the rabits and is rewarded with the key to the castle. Vahn and the party then go to Faluhd Castle and rescue the Elder's son. The boy is then returned back to his father and the Elder allows the party to travel through Organa. On their way the party discusses locations they will visit on their to the Wind Shrine. However Elina still feels weak in comparison to Nobumasa and Ami, but Vahn says that she protects them in her own way and admits that without her magic he would have never come so far. The white mage is stuttered and Vahn takes that as Elina's acceptance of her own way of fighting.
When the party arrives at Kohlingen, the town is under a monster attack. After saving a woman from the monsters, Vahn decides to talk with the town Elder to asset the situation. The Elder speaks of warnings that came from the town of Daguero about monster attacks, but recently any contact with the town disappeared. The Elder then says that to reach the town and the capital to an extent the party needs to travel through systems of caves and implores the party to check Daguero on their way to the capital. In the Kohlingen Cave, Vahn comes across Vera and Oalston fighting a chimera. After the successful battle, Vahn and his party reunites with Vera and Oalston who say that they washed up on the west coast. Vera informs Vahn that monsters try to converge around the Wind Crystal with little success and due to that many different monsters end up trapped on the Great Plain around Daguero. Vera and Oalston then inform the party of a shrine there were staying while waiting for a word from him and the two go there, saying that they will be waiting for them there. Vahn's party arrives at the Rift Shrine where they meet Ramuh who tells him to seek help in Lenadia to aid him in his quest of vanquishing Malacore, but warns the dragoon about someone who does not want him to interrupt what Malacore is doing: the Archareons, rulers of the Esper World. Ramuh says that Archareons believe that Vahn pursuing Malacore will bring about the Blackmoon Prophecy. The Esper hints at Vahn's lineage and binds himself to Vera. After arriving at Daguero by defeating Evil Wall in Rudra Cavern, Vahn and his party visit the town Elder who upon the dragoon's asking says that the town has no way to cross the mountains to reach the capital, but states that he has seen a map from the capital and suggests asking him about help. At the inn-pub the party comes across Cid, a head scientist, whom they ask about a way to the capital. The man reveals that there is a Serpent Road to the north in his laboratory, but the monster there is too strong for him. Cid then accompanies the party to the laboratory located on the Plain. There he explains that the monster that is at the top of the lab protects a cure for people who administer the Serpent Road and without it they won't be able to continue their journey. Midway through the tower the group encounters Magus Sisters who protect the tower from intruders for their master and force Vahn's party to battle but loose. Atop the laboratory, the party defeats Biblos that took residence in the place and defeating him earns the group Silvera Cure. Together with Cid, the party travels to a Chocobo Forest in Kohlingen's vicinity and with its help the group goes to an island where Silvera is located. Arriving at the town, a werewolf spots them and quickly hides in the local inn. When he knocks on the inn door no one responds, but after mentioning a cure for the town the door is unlocked and the party enters. Inside they notice a plethora of various monsters, with a werewolf one introducing himself as Arvis, the town Elder. Upon his request, Vahn hands him over the cure with the Elder promising to repay him provided the cure will help him and invites the dragoon to stay a night at the inn. By the morning the town is cured and when Vahn asks the Elder the keys for the town's Serpent Road he says that their keeper went to Kohlingen. The Elder says that the password that the keybearer will ask is "courage". From Kohlingen's Elder the group learns that the traveler from Silvera haven't stayed long and went to the Auction House. From a woman at the Auction House, the party learns the the traveler have learned some kind of pet and went to the west for some hiking. Atop Mount Matoya the group comes across the keymaster who is attacked by his pet Garuda, but they save him in time. Telling the password, the man grants them the key to the Serpent Road and wishes them luck.
At the South Shore Checkpoint one of the guards warns his colleague about the ghost haunting the building. The other guard refuses to listen to him and enters, the former one afraid that he will not be able to return home if his comrade will not return. The group then saves the other guard from the ghosts and the man opens up the gate to the east. As the group is about to leave the Checkpoint, Archareons once again ambush Vahn and his party, but they prevail and continue on their journey. On their way to Lenadia Castle, the party is stopped at one of the bridges leading to it and is asked to wait at Cornelia. In the port town they come across Siegfried, a world class swordsman. Initially he loaths the dragoon and attempts to get rid of him, but after the two share their stories, Siegfried offers to join Vahn on his journey, hoping that in his travels he will find Excalibur, the sword he is looking for. He then challenges him to a one-on-one duel as a form of test and Vahn bests him, resulting in the swordsman joining his group. The group then decides to spend a night at Cornelia, waiting for the blockade to lift off. Vera is thinking about Ivalice, when Ami unexpectedly joins her. Vera reveals to her that she must have a sleeping problem, but also a lot on her mind, especially since rejoining Vaan, and Ami takes it for a forming deep bond between the two. Vera denies it and asks Ami about her carefree behavior that somewhat contradicts her age, all while briefly being spied by Nobumasa. Ami says that behavior does not bother her and she can be serious, and she offers Vera to demonstrate it. Vera refuses and advises them to go get some rest or Vahn will have problems waking them up and the two retire to the inn. The next day the group arrives at Lenadia Castle where King Gorn informs them that the reason why the bridge was out yesterday was because of a diplomatic group from Ivalice. Vahn informs the King about Malacore and his plan, and the King allows them to check up on the Crystal of Wind while he consults with his strategists. Vahn and his party arrives at the Crystal Chamber in Wind Shrine where Malacore is already attending to the Crystal. The being orders the Necromancer to fight the dragoon and his party, but by defeating it the party is too slow to stop Malacore who has absorbed the Crystal's power. Malacore then challenges the party to a battle, intending to demonstrate his newly acquired power, but a voice interrupts him. Malacore recognizes the voice and identifies it as Darius, who has slept within Malacore. The fallen dragoon then taps into the Crystal power absorbed by Malacore and frees himself from the ties to Malacore and materializes before the entity is able to neutralize his consciousness. Darius then attacks Malacore with the power he attained from his ties to him and the being escapes, shortly after declaring its next target: the Crystal of Earth. Vahn decides to quickly go to Lindblum Kingdom and wonders if Darius will join him if he is not intending to return to Branch. Now the dark knight then says thay he wishes for nothing else and that he wants to pay back to Malacore for what he did to him. Just as the party leaves the Wind Shrine, Braak appears in the back noting how fruitful spying on Vahn and Vera has turned out. When the party returns, Lenadia Castle is under Ivalice attack and the group rushes to the throne room. In the throne room, Vahn comes across Braak, Deckar, and Eva and the blonde general reveals that Ivalice has suspected of something going on in Branch, hence his appearance there. Braak reveals that the Emperor wants to rule the world, seeing how Crystal power is powerful, and in order to achieve it he plans on conquering other lands. Appaled by hearing the generals' words, Vahn and his party fight and defeat them. Before teleporting away, Braak promises King Gorn that "this is only the beginning". The group retreats with the King to the conference room where they relay him the fate of the Crystal of Wind. During their conversation, Vahn reveals to King Gorn that apart of Malacore and Ivalice Empire, there are also Archareons who pose threat to them. The King says that the group shouldn't concern themselves with Ivalice for the time being as he will involve Lenadia in this matter, but also pursue alliance with other kingdoms. Darius then suggests going to Lindblum to to prevent Malacore from absorbing the Crystal of Earth. Back in Cornelia, Vahn enlists Cid to help him and his group travel to Lindblum.
After arriving in Lindblum, the party goes through the Cave of Dreams. Deep within the cave, most of the party suddenly falls asleep, with the exception of Ami and Nobumasa. In the dreams, Vahn appears in his hometown of Valla. He talks with his mother Elise who informs him that a dinner will be soon and Vahn decides to look around town. When he returns home, he says he has helped a girl find her doll and when he starts to inquire her about his father, Elise refuses to speak about it and the dragoon steps out of the house. When he enters the Elder's house and asks him about his father, the Elder assumes a monstrous form and multiplies across all over the house, promising him to tell Vahn provided he will stay forever in the town. Another dream takes Oalston back to Trei, in a setting where Malacore was defeated. Everyone is hateful towards Oalston and when he inquires the doctor about it he learns that he has murdered Maria. The guard then arrive and with the help of Doctor Cunnings they strip him of his power and imprison in his own house. Next dream takes Darius back to Branch, also after Malacore's defeat, where he returns to former glory and is assigned the role of general. Lord Adder orders him then to go to Meksicburg and slaughter anyone who does not show any respect for the dragoons since the townsfolk does so on regular basis. Darius is surprised by Lord Adder's course of actions, but he intends to carry the order out after the Lord's harsh words. From the other dragoon Darius learns that Lord Adder plans to launch an assault on Ivalice, and the dark knight decides to look for Vahn and Hans hoping they would talk some sense into their leader. He finds them in the dungeon where they inform Vera of her incoming execution and Darius decides to save her, only to be attacked by Vera. Hans and Vahn then turn into humanoid dragons that intend to put him to sleep. Elina's dream world is set in Mystic Mysidia's Elder's house where she writes a letter to her mom about how everyone praises her progress in styding white magic, however she feels insecure about her abilities. In the town she comes across ghosts disgusted by her. Back in the Elder's house she comes across Vartz who mocks her and reveals that because of her lack of abilities she couldn't save anyone and now is alone. Another dream world takes place in Albrook where Vera is hunted down by Ivalice soldiers, who upon seeing the situation in town decides to go to Branch and see Vahn. However as she is about to leave the town, she is strangely teleported to its entrance once again and falls asleep. Siegfried's dream takes place in a forest where he is searching for the Excalibur. Deep within the forest he comes across an old fisherman who reveals that the "Excalibur" is just a fishing hook and when Siegfried faints, the old man is joyful with the other man's failure. Back in the Cave of Dreams, Ami tries to persuade a creature to stop its doings, but Nobumasa urges her to take action, fearing for their comrades. The two defeat the demon and their friends wake up. Hearing from Nobumasa about the creature, Vahn urges the party to quickly leave the place, fearing that more monsters of that kind might be still in the Cave.
Arriving in Lantz, the group learns from the town Elder that a rebellion has grown in Lindblum, mainly fueled by the unrest caused by the Regent's priority on increasing the Kingdom's economical value. The rebels frequently destroy bridges that connect Lantz to western Kingdom and Vahn and his party volunteer to talk to the rebels and convince them to stop their actions. The party then departs east, on a newly rebuilt bridge to find the rebel base. While resting at the inn, Vera invites Vahn to a stroll across the riverbank and the dragoon takes her upon the offer. During their walk, Vahn expresses his doubts about being able to save the Crystal of Earth before Malacore absorbs it and Vera calms him by saying that as they travel the world they are also enlisting help of kingdoms' leaders and that Malacore has no way to win against that meny people. Suddenly a group of rebels appears and the two quickly dispatch them before they destroy it. After they return to Lantz to speak with the Elder, they comes across a group of rebels in his house and dispatch them. They then go after the Elder to rebels' hideout. Vahn successfully rescues the Elder in Rebel Hideout and they return to Lantz. With the Elder back in town, the western bridge leading to western Lindblum is rebuilt and the party continues on their journey.
Nobumasa quietly returns to the Village of Zen where he is welcomed with open arms as the resentment that villagers had to him in the past has washed away. Nine years after the Great Cataclysm, Nobumasa tears down the Tower of Trials. He becomes a grandmaster for many decades. He passes away at the age of 104. He is considered the most successful ninjutsu user ever known.
- Main article: Ninjutsu (Blackmoon Prophecy)
"Nobumasa" is a masculine Japanese given name. Nobumasa (永将?) roughly translates to "eternity leader" and this is reflected in his life after the events of Blackmoon Prophecy.