Koibito wa Oni no Hime

A man named Hayato had a childhood encounter with an Oni princess and promised to marry her when he turned eighteen. After that, he began suffering embarrassing incidents involving physical contact with women, leaving the reason unclear. He decided to avoid relationships during high school. However, when the now-grown-up Oni princess, Sakura, returns as promised, their story unfolds alongside the mystery of a curse linked to these incidents.