She's just a regular, sweet-looking college student by day. But by night, she's a part-time assassin — and she's about to face her toughest target yet.

Yuma is a young Japanese woman with cerebral palsy. Torn between her obligations towards her family and her dream to become a manga artist, she struggles to lead a self-determined life.

In an alternate Japan, territorial street gangs form opposing factions collectively known as the Tokyo Tribes. Merra, leader of the Wu-Ronz tribe of Bukuro crosses the line to conquer all of Tokyo. The war begins.