Takashi Mitsuya/Synopsis

History
Ever since he was a child, Mitsuya mostly took care of household chores and his two younger sisters, Luna and Mana Mitsuya, since their mother was always at work. One day, when he was walking in a playground with his younger sisters, he saw Hakkai Shiba beating up someone. He stopped Hakkai and told him that violence should always be used to protect. The two officially met and Mitsuya invited Hakkai to their house. Since then, Hakkai looked up to Mitsuya as an ideal brother.

On a rare occasion, Mitsuya ran away from home at night and left his two younger sisters alone. During that time, he graffitied a dragon on a wall where he didn't realize that someone was watching him, there he met Ken Ryuguji, Mitsuya ate all of Draken's food but the latter suggested that the dragon graffiti will be his in exchange for the food. Draken then brought Mitsuya to his home. After playing and winning easily in poker with Draken and the girls in the brothel, he said that they were so lucky and he wanted to live there too. One of the girls then lashed out at him suggesting that he go home. Draken told him that, for the girls, it is not a place where you can just stay at. After a few months, they met each other again only to find out that they have similar dragon tattoo. Thus, the Twin Dragons were born.

Mitsuya eventually became close with the other founding members of Toman even before it was formed.

Toman Arc
At Toman's meeting at Musashi Shrine, Takashi sees two Toman members trying to chase away a boy and he realizes he must be Takemichi Hanagaki, and scolds the member for trying to scare the commander's guest.

Moebius Arc
Takashi then takes Takemichi to Manjiro Sano. As the meeting starts, Haruki Hayashida and Ryohei Hayashi pick on Takemichi, but Takashi reminds them they were told to drop the Masataka Kiyomizu subject. As Ken Ryuguji stops them, Ken and Takashi explain that Pah-chin's is in a bad mood, because his bud got beaten up and his girlfriend raped by Moebius' leader Nobutaka Osanai and this is the reason for the gathering and conflict with Moebius.

After Pah-chin attacks Nobutaka Osanai and is taken in prison, Takemichi encounters Takashi and informs him that Ken will be attacked, however, Takashi already knows, but is surprised its Masataka Kiyomizu and not Peyan. Takashi reveals that Manjiro wanted to pay to free Pah-chin, but Ken was against it. Takashi is surprised that Takemichi managed to stop Manjiro and Ken's fight, even after their captains couldn't, but is thankful to him as that could have split Toman. Takashi states that everyone came to an agreement that they couldn't do anything about Pah-chin, except Peyan. While looking for Ken, Takashi explains that Peyan believes Toman abandoned Pah-chin and teamed up with some Moebius members to take out Ken. They find Ken fighting numerous Moebius members. As he is getting tired, he sits on the ground and tells Takashi that he leaves things to him. A moment later, they hear a bike and recognize its Manjiro's. Shuji Hanma reveals himself and as the rest of Toman arrives, a fight between Toman and Moebius start, where Toman manages to win.

Valhalla Arc
A time comes to choose a new 3rd Division Captain as Toman prepares to fight Valhalla. Manjiro announces the new captain would be Tetta Kisaki, but Takemichi ends up punching him. While they yell at Takemichi for what he had done, Keisuke Baji steps up and attacks Takemichi, but Takashi stops him. A bit later, Takashi eavesdrops on Takemichi and Manjiro, who make a deal that if Takemichi brings Keisuke back Valhalla, he will kick out Tetta. Manjiro sees Takashi and calls him and tells him that Takemichi is joining Toman officially and will serve under Takashi in his 2nd Division.