The story's protagonist is a chronic insomniac who lives and works as a janitor in a love hotel. The inability to get a good night's rest leaves him feeling exhausted and unmotivated during the day.
To sleep soundly at night, he needs to murder someone. For that reason, he also works secretly as a hitman for the high-ranking yakuza executive, Tougi Mamoru.
The days were calm and steady despite the inherent danger of the work.
One day, the protagonist makes contact with Azami, the call girl. In light of the fact that he had the best sleep ever after making love to her, he began to think about having her around.
However, Tougi is hot on Azami's trail after an incident, and if he were to keep her, he would have to betray the boss and ruin his peaceful life.
[Translated and edited from the official site]