Samon-kun wa Summoner

Sakura Teshigawara's life gets turned upside down when a strange boy shows up at school and says his hobby is summoning demons! But he's not kidding! It really is his hobby. Making matters worse, he seems to be fixated on her! Looks like school's about to get a whole lot more interesting!

(Source: Viz Media)

Included one-shot:
Volume 1: Moromono no Jijou