Anime: Hunting Demons in Tokyo

A Character Card System that lets you gain power by filling character-card progress bars, granting you the supernatural abilities of the characters on the cards.

Sounds great, but what if it requires you to become a harem king with a full-fledged harem?

Unwilling to become a scumbag but still wanting supernatural powers, Kimura Futa can only work hard and explore step by step, relying on the five percent of character-card power he got as a bonus!

Many years later, he looks back and realizes he has become the savior of Japanese high school students.