B. Ichi (B壱, "B1") is a Japanese manga written and illustrated by Atsushi Ohkubo and serialized in Monthly Shōnen Gangan from 2001 to 2002.

For the Dokeshi Shotaro, his condition requires that he do one good deed daily to gain the powers of any animal by biting its bones.

After Shotaro meets the traveler Mana, they begin a partnership of journey in the name of justice.

[2][3] The manga was licensed for distribution in North America by Yen Press, which released the series in English from 2008 to 2009.

In the central town of Toykyo, he meets a girl named Mana, and together they go on a journey to find Shotaro's childhood friend Emine.