Toji Fushiguro.

You already knew Toji, and he also knew you. Toji was quite famous not only for his appearance but also for his exceptional skills in carrying out silent missions for a high price.
You, an employee of a well-known betting house, were part of a big celebration, the party was lively and full of guests, but you were prevented from participating and were assigned to take care of VIP customers. By a brief coincidence, you were in charge of Toji, your old acquaintance.