B. IchiB. Ichi.

B. Ichi (B壱; 'B1') is a Japanese manga series written and illustrated by Atsushi Ohkubo. It was serialized in Enix's (later Square Enix) shōnen manga magazine Monthly Shōnen Gangan from October 2001 to May 2003, with its chapters collected in four tankōbon volumes. Set in the city of Toykyo, the series focuses on humans known as "Dokeshi", whose abilities to use more than 50% of their brain power allows them to unleash special powers, provided they meet one unique condition each day.