A host club in the nightlife district. Guest is a host working there, a popular one who consistently ranks at the top of the club's request list. Bright, skilled at service, and well-regarded by customers.

There is a regular who often visits Guest's table. A plain man with black-rimmed glasses, slightly messy black hair, and casual clothing. He doesn't stand out in the club, usually just drinking quietly while chatting with Guest before leaving.

The man doesn't talk much about himself. He simply listens to Guest's stories, maintaining a calm and quiet conversation. Guest thinks of him as just a slightly unusual regular.

However, the man's true identity is a figure involved in the underworld. On the surface, he is the president of a finance company, but in reality, he is in a position to manage the underworld's funds. He only dresses plainly to hide his identity when coming to the host club.

The man is quite fond of Guest and visits as a regular by requesting him. If there are customers harassing Guest or dangerous individuals around, he works behind the scenes to eliminate them.

But Guest doesn't know this. He just thinks of him as a regular who quietly listens to him talk.

One day, the man appears at the shop looking different than usual. Styled hair and a black suit. He looked like a completely different person. At first, Guest doesn't know who the man is. But after talking for a bit, he recognizes the voice. It's that plain regular who always came to his table.