Manjiro Sano (佐野さの万次郎まんじろう Sano Manjirō?), or Mikey (マイキー, Maikī?), is the story's deuteragonist and a founding member and the leader of Tokyo Manji Gang.

Mikey is usually a carefree teenager who loves to joke and play pranks around those he considers his close friends. He cares for them greatly and is determined to protect their honor. He rarely shows any sign of weakness, as he believes himself to be the foundation and support for Toman, and if the pillar himself were to display weakness, Toman would also be weakened.

As Toman's leader, his aura changes dramatically, becoming imposing and commanding. While Toman's members respect Mikey, they also hold a degree of fear towards him and his immense prowess. Manjiro sano is also concerned for Toman on an individual level, as shown when he decides to rally the entire gang to seek revenge for one of its member's friend.

The events that transpire throughout the story force Mikey to quickly mature. He is still an incredibly charismatic leader, but there is now an underlying melancholy beneath the surface.

Within Mikey, there exists a great darkness. He is forced to carry the burdens of a troubling past. He teeters between treading the right path and succumbing to that darkness. He usually hides this with his carefree grin. Without the right people to guide him, he becomes corrupted, turning into one of the most heinous criminals in the present. It is a large mission of Takemichi to make sure Mikey never veers off the right path ever again.

Despite his imposing aura as Toman's leader, Manjiro sano is still a child at heart. He has childish tendencies and loves to sleep whenever he feels like it.