Based on the game by Cocktail Soft.

Collin, a relatively noble but ordinary man – finds himself lured to a cave by a dream in which a beautiful girl named Feelia appeared before him. Even as he was warned off by the elder of his village, he still feels drawn in… and with the arrival of a beautiful adventurer, and just a trace of seduction… in he shall go.

But what lies in wait? And what of the mysterious girl who appeared to Collin in his dream?