Yasuhiro Muto/Synopsis

History
Mucho was born in the year 1987 which made him qualify as a member of the S-62 Generation, a small fearsome group that was formed in a juvenile detention center known for committing various criminal acts with Izana Kurokawa as their leader. After their release, Mucho took part in committing robbery, assault, and selling drugs among others and assembled gangs of their own, until Izana stepped back from their activities and influenced the other members to do the same. Eventually, Mucho joined the Tokyo Manji Gang and rose to the top of the ranks as the Fifth Division Captain, after supposedly establishing the Yokohama gang Tenjiku with Izana himself.

Moebius arc
Mucho arrives with the rest of the Toman members to support Manjiro Sano and Ken Ryuguji in fighing off Moebius. He comments that infighting is not his thing, but is excited to fight against another gang. As the battle commences, Mucho shows his strength by easily tossing around members of Moebius.

Tenjiku arc
In an emergency meeting at Musashi Shrine, Toman urgently scrutinizes Tenjiku's unexpected attacks on its members across all divisions. The discussion stirs at the mention of the prominent members, or the "ghosts," of the S-62 Generation, and Mucho supplies that Shion Madarame, a Tenjiku member who brawled against the Second Division in Shibuya, is also part of the group, Later on, he arrives at Takemichi Hanagaki's residence with his Vice-Captain Haruchiyo Sanzu. He commands his division to restrain the First Division members as he knocks Takemichi out with a powerful blow. As Takemichi passes out, Mucho irksomely curses at Izana for making him work and instructs Sanzu to situate him in the car.

Beaten and worn out, Takemichi awakens after some time to find himself and Mucho in a seemingly deserted warehouse. Mucho greets him as he stirs awake and commands Takemichi to examine his surroundings while objecting to Mucho’s untimely efforts in restraining him, knowing full well that Toman is currently clashing with Tenjiku. Nevertheless, Mucho ignores his protest and reveals a bound Seishu Inui beside Hajime Kokonoi who is similarly duct-taped to a chair. Koko informs Takemichi of Mucho’s past as a member of the S-62 Generation and his allegiance to Izana while Mucho shortly reminisces his life in juvie with the rest of S-62. Afterward, he claims that the situation at hand is strictly a matter between him and Izana only.

Takemichi asks Mucho about his intentions in abducting him alongside Koko and Inupi. Mucho explains that Mikey has granted his division the special role to initiate infighting as Toman’s “Public Morality Council” where traitors to the gang may be punished without the leaders’ consent. Takemichi wonders if Mucho suspects him as a traitor, but Mucho tells him that he has no clue. His true intentions are soon disclosed when Inupi points out his bluff and insists that he, Koko, and Takemichi have not done anything to betray Toman. Mucho then admits that his role as the Fifth Division Captain has no correlation to the given situation and proceeds to confess the crimes he committed with Izana until the latter’s withdrawal from the group during his time in S-62, after which he tells Takemichi that he is a founding member of Tenjiku. Takemichi asks Mucho if he is betraying Toman, and Mucho states that his actions would be different if only he had met Mikey sooner. With Izana back in action since his departure from S-62, Mucho now views Toman as his enemies. Still in the warehouse, Takemichi tries to convince Mucho that Izana's only goal is to crush Mikey and put an end to the entirety of Toman. However, Mucho tells him that Mikey is not the only person that Izana is after and reveals that Koko's supreme ability in finance is what Izana wants to make use of for Tenjiku to prosper. He also says that Izana desires KIsaki's intelligence and Mikey's charisma for the benefit of the crime syndicate that he wishes to create. Mucho criticizes Koko because of his unbreakable loyalty to Inupi who is currently under Takemichi's division and announces his plan to kill the both of them to free Koko from the chain of command, which would eventually leave him with no other choice but to join Tenjiku. Mucho puts up another offer about releasing Takemichi and Inupi in exchange for Koko's compliance with his orders but is talked down on when Takemichi attacks him to protect his subordinates with Inupi as a backup. In the end, their fight is interrupted by Koko's acceptance of his offer and demands he lets his friends go. On the night of the fight against Toman at Yokohama Bay, Mucho is seen gathered with the rest of the Tenjiku executives. He tells Izana to make S-62's fallen dreams a reality and that Toman is ultimately vanquished against them. Later on, he challenges Inupi in a battle in Koko's behalf and easily defeats him using Judo. As they fight, Izana informs Shuji Hanma of the assault charges pressed against him before meeting each other in juvie. According to Izana, the man Mucho assaulted ended up with a spinal injury and was paralyzed waist down after slamming him into concrete. When Souya Kawata defeats Ran and Rindo Haitani, Mucho praises him for being Toman's dark horse and attacks, but is eventually bodied and slammed to the ground by Angry.

As Mucho lies defeated, he reminisces the time when he pledged allegiance to Mikey. He admitted that he already followed an absolute "king" (who was unnamed but suspected to be Izana) yet Mikey told him that it did not matter since he greatly needed Mucho in Toman. At present, Mucho reflects on his immediate loss against Angry and remembers Izana's orders to kill someone from the opposing gang. Mucho unravels a knife and declares that he will not lose, then swings the knife at Angry who Takemichi blocks and steps in front of. However, Kakucho Hitto stops him from swaying the knife and punches him in the gut. He tells him to not get corrupted by Tenjiku as he finally admits defeat.

The battle goes on with Mucho watching from the sidelines while Kakucho and Tetta Kisaki confront Takemichi. When Toman regains their energy after Kisaki refuses to kill Takemichi, Mucho concludes that Toman's willpower is what sets them apart from Tenjiku. He also wonders what Izana truly wants to achieve in Tenjiku. At the end of the fight, he advices Mikey to flee the scene as he and the rest of the S-62 Generation stay behind. In a flashback in Mucho's point of view, Mucho was seen swearing allegiance to Mikey and convinced himself that Toman was where he belonged. After becoming the Fifth Division Captain, Mikey introduced him to Sanzu whom he placed under Mucho's division since the other leaders could not discipline him. Mucho also had a tough time managing him but often tolerated his stubbornness and claimed that they were alike in terms of feeling out of place in the gang. Nonetheless, Sanzu followed his orders.One day while playing Shogi with Sanzu, Mucho brought up his suspicions on Keisuke Baji and condemned Mikey's decision to still keep him around. Sanzu told him that he was his childhood friend and made a move on the board, telling Mucho that the King chess piece was more important than anything else. Sanzu also admitted that he caused trouble against Yotsuya's gang because they made fun of Toman, to which Mucho replied with an advice to keep an eye out for himself. He gave Sanzu a mask afterward to cover his facial scars.

Six months into Sanzu's membership in the Fifth Division, he became Mucho's right-hand man and admired him as an older brother. Six months after Tenjiku's fight against Toman, Mucho was fetched by Sanzu from the penitentiary and was taken to the seventh pier at Yokohama Bay, the location of the battle between Toman and Tenjiku. In the pier, Mucho was killed by Sanzu with a katana at the expense of his betrayal to Mikey and Toman, claiming that the King is more important than anything else.