A Dark Rabbit Has Seven Lives: Kurenai Gekkou no Seitokaishitsu

A freshman of Miyasaka High, Kurogane Taito was average at everything. And all this while, he had believed himself to be an ordinary regular guy. But, he was wrong. The reason was because of a certain event 9 years ago. For the sake of a promise he had made then, he had already stopped being ordinary a long time ago. However, not a single fragment of his memory about that promise remained. Who had stolen his memory and to what ends? One day, as a consequence of a certain event that had descended upon his ordinary life, his memories were restored. That marked the beginning of his “extraordinary” life... --- you’ve finally died. I’ve been long waiting for this day --- I’ve always thought that I’m a supporting character in life. But once again, it starts from here. My story. I’ll “die 7 times” for your sake Everything starts from that promise. A story of a reverse school fantasy! (Source: Baka-Tsuki)

Spin-off of the original Itsuka Tenma no Kuro Usagi series.

This is a side story to Itsuka Tenma no Kuro Usagi. It follows the angsty loner Liene, along with her two classmates--big-breasted Clara and cheerful Chiya--as they train to become first-class witches. In order to become a first-class witch of the Temperon Crowley association, they first have to make a contract with a demon, which costs the thing they cherish the most (generally assumed to be a girl's virginity). Liene wants to become a first-class witch so that she might have a chance of meeting the parents who abandoned her as a baby. However, she's going to have to learn that she can't do it alone. She'll have to cooperate with her first real friends, Klara and Chiya, and with her new demon companion Pelty. (Source: MangaHelpers)