Kimi wo Shinryaku Seyo!

Hajime Sorajima's got a terrible hairstyle! It's so weird it's downright embarrassing. But his hair's got a secret...it's not hair! It's the horns of an alien body! A cute little alien body! One that can transform into a human. Normally, he has no problem living among humans and his secret is safe. That is until he meets a strange girl named Ria Aiba who's convinced he's an alien! Will she blow his cover?

(Source: Viz Media)