Muroi, who retired from the police early, took in the children affected by the incident and moved to Tohoku. Although he was told cold words from those around him, he lived quietly while protecting his children. However, the body of the perpetrator of the special fraud and robbery was found deep in the mountains, and the village fell into chaos.

A famous businessman's links with organized crime are looked into by the Zero Division of the Tokyo Police, with the investigation being headed by a highly trained, extremely violent and very beautiful female officer. When not having shoot-outs with the crime syndicate thugs trying to kill her, she spends most of her time in her apartment, wearing lingerie and taking showers. A sub-plot involves the businessman's S&M-obsessed daughter.

Tsutsumi Takeru is a 4th year university student. He worries about finding a job after graduation. He currently works part-time at a bar called Double at night. He begins to write down his thoughts in a notebook that is used for work at the bar. During the day, the bar turns into the Cafe Double. Murakoshi Miyu works part-time at Double during the day. She is studying to become a nurse, which has been her dream. She communicates with Takeru through the notebook that is used at Double. While conversing about their hobbies and worries, they become closer and fall in love.