Hanayome wa Oku-san

Oku meets Nana again after they slept together long ago. In the past, Nana was The Prince of Good Fortune. There was a jinx that any woman who slept with him would become lucky and their wish granted. So, Oku asks Nana to try sleep with him to see if he can also make guys lucky as well. However, Oku's purpose wasn't about luck but his secret feelings.