Incubus Banishment - Chapter 13: Adventurer Registration

A 34-year-old NEET otaku, chased out from his house by his family, found that his life is reaching a dead end. He then recalled that his life could actually have been much better if he had made better choices in the past.

The person whom the world revolves around.

One night she gets drunk and mistakes the most well-known Mafia boss for a Host* and intends to sleep with him.

This is an alternate history. Decades after the fall of the Eastern Jin Dynasty, the world is still in chaos, although there is hope for reunification.