Hiroko attends the memorial service of her fiancé, Itsuki Fujii, who died in a mountain-climbing incident. Although Itsuki's mother says that their old house is gone, Hiroko records the address listed under his name in his yearbook and sends him a letter. Surprisingly, she receives a reply, and discovers it came from his old classmate, a girl who also happens to be called Itsuki Fujii.

Ayaka Miyazono and Aizawa Echika, both living in Roppongi, investigate a woman's death.

With a single appointment letter, Tokyo University graduate Kohei's bright future and relationship with his high class girlfriend is turned upside-down. Ordered to work at a pachinko parlor in the city outskirts, he must now live and learn from his new coworkers and customers and their many quirks.