Hitomeguri / Hitou Meguri The Animation

 Chitose-chan, at such a young age, already runs a resort inn that she inherited from relatives. Her cousin Ken-kun has been in love with her for a long time, but she seems not to notice it. Soon he becomes a witness to a scene of Chitose having sex with one of the inn's guests, whom she despised... Our hero is in turmoil and goes crazy with jealousy, but can't do anything...