Chisato and Mahiro are two high school girls who are about to graduate. They also happen to both be highly skilled assassins. When the organization they work for orders them to share a room, the relationship between the pair quickly turns sour. However, when they find themselves targeted by the yakuza, the girls quickly realise that they will have to find a way to work together.

After being suspended from their agency due to a rules violation, teenage hitmen Chisato and Mahiro are forced to get “real” jobs to make ends meet. But while the elite duo is forbidden from executing targets or enemies under any circumstances, two aspiring rival hitmen decide to eliminate the competition while they’re vulnerable—leading to a lightning-fast showdown between trained killers.

Teenage assassins Mahiro and Chisato visit Miyazaki for a contract and a vacation when they unexpectedly cross paths with a legendary, bloodthirsty assassin who's looking to add to his personal body count.