Hanayome wa Oku-san

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