Akira Sato is the legendary killer known as The Fable. Following the order of his boss and due to being overworked, he lives peacefully with his partner Yoko as ordinary siblings. Akira still works part-time at design company Octopus with CEO Takoda and employee Misaki. CEO Takoda and Misaki are unaware of Akira's background as an assassin. Meanwhile, Utsubo is a representative for an NPO. However, Utsubo works with contract killer Suzuki to set people up for extortion purposes. They target someone at design company Octopus.