Fushigi no Kuni no Succubus

This is an anime adaptation of Muni Koubou’s video game.

One day, while he was walking, Reto fell into a well. Following this incident, he found himself in front of a castle. However, in front of it there is a very seductive succubus. Feeling in danger in the face of the latter, Louise the daughter of the local queen, decides to help Reto.