Based on the erotic game by DWARFSOFT.

Toshio is a 42-year-old single man whose hobby is visiting brothels. A woman who calls herself Iris suddenly appears in front of him and begs Toshio to teach her how to please a man! Toshio, who has an insatiable libido, has no way of refusing the offer, so he uses his skills to give Iris, who has no sexual knowledge whatsoever, a sex education! However, Iris' true identity is that of a princess from another world... Queen Cattleya appears, unable to bear to see the princess have fallen so completely!

(Source: Lune-soft, translated)