The Yamagasa Festival, one of the three biggest festivals of Hakata, is in full swing. Banba, born and raised in Hakata, is taking time off work to celebrate. The ace assassin of a contract killer agency Saruwatari has developed a distaste for work he does not find challenging. He decides to quit and move Hakata where there is more competition. As soon as he arrives, Saruwatari’s partner from high school Nitta calls out to him. Nitta works as an assassination consultant and wants to utilize Saruwatari’s skills, but...