Tsubasa Tobinaga

Chisato and Mahiro, who share a room, may look like any ordinary girls you would find anywhere. Their true identity, however, is a pair of extremely skilled cold-blooded assassins belonging to the Hitmen's Association like employees with a contract. Chisato is sociable, in contrast, Mahiro has a spectrum of communication disorders. They also work part-time jobs in order to maintain their appearance as ordinary people.

When late fees threaten their standing in the assassins guild, teens Chisato and Mahiro take part-time jobs only to find a bounty on their own heads.