As teenage assassins Chisato and Mahiro are suspended by their guild due to a rules violation, they are hunted down by two brothers and fellow assassins looking to kill them for a large bounty.

The two assassins are suspended via a video chat for perceived violation of the rules governing the assassins' guild. Ironically, this happened while they were trying to pay their guild overdue fees. There are two assassins on their tail now and the cleaners dispatched to help make matters worse.