Samon the Summoner

Samon the Summoner (左門くんはサモナー) is a manga series written and illustrated by Numa Shun.

Plot
Sakura Teshigawara might be the nicest girl you will ever meet. She will catch your vomit so that you don´t get it on your clothes while asking how you feel afterwards. In short, Sakura Teshigawara is a good person. That is why, Samon, the new transfer student hates her. There is no one else in the entire world that Samon hates more than Teshigawara. For the sake of his pride, he will corrupt her before she dies and fall into hell.