Teenage assassins Mahiro and Chisato visit the coastal city of Miyazaki for a contract and a vacation, but they unexpectedly cross paths with a legendary, bloodthirsty assassin looking to add to his kill count.

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.