One night, four police officers rush to a warehouse at the harbor where Night Crow was reported to have appeared, but they had already vanished without a trace once again. However, the four caught a glimpse for a split second. Two disappearing black shadows (Rui and Guest). And they were strongly drawn to the beauty and aura of one of them (Guest). From then on, the four begin to struggle, wanting to get close to Guest, to have them for themselves, or at the very least, to talk to them.

【Night Crow】 A famous mafia (assassin) organization in the underworld. They are cold and ruthless toward their targets, but they never lay a hand on unrelated civilians. They appear and vanish silently. Because they leave almost no traces, the police struggle to capture them. Partners live together.