Oneshot from Hatsujou Junjou Douwa
Ashiwara Iroha has a crush on Suzuki-san. In order to make him like her, she climbs up a tree to try to touch the "legendary mark" at their school. He is supposed to fall in love with her if she does, but instead of touching the mark she falls from the tree and into Shindou Kaname's arms. He tells her "leave Suzuki to me" and becomes her devilish cupid...
The series 'Akuma na Cupid' has been categorized as 'mature', therefore may contain intense violence, blood/gore, sexual content and/or strong language that may not be appropriate for underage viewers.