Satoru Mizushima is a designer, who prefers traditional things like handmade items and handwritten works. One day, he happens to meet a mysterious woman, Miyuki Miharu, at the cafe named Piano. She seems to have similar values to him and he is attracted to her. Satoru asks for Miyuki's cellphone number, but she doesn't own a cellphone. They make a promise to meet at the cafe every Thursday. Since then, Satoru and Miyuki meet every Thursday and their relationship develops romantically. Satoru decides to propose Miyuki, but she doesn't show up at the cafe.
Akira 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. But, Utsubo works with contract killer Suzuki to set people up for extortion purposes. They target someone at design company Octopus.