Manjiro Sano/Synopsis

History
Ever since he was a child, Mikey was under the care and guidance of his martial arts master grandfather. As a result, he underwent rigorous martial arts training and was recognized as a genius. He lived with his grandfather and brother together in the former's dojo.

Sometime around elementary school, Emma Sano came to live with the Sano family. That is when he got the nickname 'Mikey' so his sister did not feel left out with a foreign name. The two eventually formed inseparable sibling bond. That to people who do not know, they appear as close as couples.

In fifth grade, Mikey met Draken when the latter was instructed by older children to bring him to them so he could get beaten up. Mikey takes an interest in Draken and agrees to go meet the older kids. Upon meeting them, Mikey immediately executes a flying kick to the leader's face and breaks several of his teeth. Mikey then nonchalantly invites Draken to hang out with him instead, to which the latter happily agrees to.

In Mikey's first year of middle school, he and some friends decide to form a gang, naming it Tokyo Manji Gang.

Toman Arc
Mikey and Draken visit the fights organized by Masataka Kiyomizu. Mikey is initially shown to be quite carefree and informal, but upon his reception by the audience, becomes more aloof. Despite reactions from the crowd, Mikey does not acknowledge any of them, instead approaching Takemichi Hanagaki. After being introduced, Mikey gives him the nickname of Takemitchy, and decides that from that point onward the two will be friends. Draken and Mikey then break up the fighting ring, declaring that underground fights are not permitted in Toman.

The following day, Mikey and Draken come to Takemichi's classroom. Hearing that Takemichi was being kidnapped, Hinata Tachibana runs after them. Upon meeting Mikey, she slaps him in the face and attempts to leave with Takemichi, but is stopped by Draken. Mikey says he is going to kill the two, but Takemichi protests, and asks him to forgive Hinata. Mikey prepares a punch, but then laughs and says that he was only joking, and that he would never hurt a girl.

Takemichi, Mikey, and Draken then leave peacefully, and Hinata apologizes, saying she misunderstood the situation. Mikey accepts, but reprimands her, saying that her actions could've been bad if he was a dangerous person and calls her a nice girl, telling Takemichi to take care of her. The group bikes to a river and Mikey mentions that he likes Takemichi, because he reminds him of his older brother of 10 years, who had died. He states that he wishes to create an era of delinquents like the one his brother was a part of, and asks Takemichi to assist him.

The following after that, Mikey was seen gathering everyone at the meeting. He announces at the meeting, standing up, stating that they gathered to discuss upon Pah-chin's problem: one of Pah's friends, got caught up in a fight with Osanai, which led to members of Moebius raping his girlfriend, killing his parents and siblings, and taking his money. Mikey asks Pah whether or not he wants to fight Moebius over it, and when Pah agrees, Mikey rallies the rest of Toman to the cause, stating that they’ll have a battle with Moebius on August 3rd at the Musashi Festival.

Deciding to become Draken's "bodyguard", Takemichi decides to follow Draken around to keep an eye on him without permission. He notices Draken going into a restaurant where he thinks he may be fighting with Mikey, but it turns out to be a series of misunderstandings over Mikey not getting a flag in his kid’s meal rice and then falling asleep after eating, resulting in needing to be carried out of the restaurant by Draken. At the hospital, Mikey was seen along with Draken, going to visit Pah's friend's girlfriend. The girl's father appears, yelling at both of them for being there. At first, Mikey was reluctant to bow and show he’s apologetic because he doesn't believe they had anything to do with it, but Draken pushes him into a bow anyway. After the girl’s parents leave, Draken tells Mikey that it is their responsibility to not let outsiders get harmed due to what happens in their world, and that he doesn’t have to bow but he needs to care about others and have a heart. Mikey apologizes and tells Draken he’s glad he’s here with him.

Tenjiku Arc
In year 2018 in a new alternate timeline, he fled to Manila, Philippines, to escape the authorities. Remembering something Mikey had told him in the past about his brother visiting Manila, Takamichi finds him there alone in an abandoned building. There, he meets his end by Naoto's hand.