Hell Girl (2005) : 2x6

Hosono Souta is a boy who always sits in the infirmary. Because of this, his classmates make fun of him. He falls in love with a classmate, Nitta Kiwako, because she was the only one who did not make fun of him. He dislikes her current boyfriend. Hosono attempts to access the Hotline to Hell, but Ai rejects him. While Hosono is stalking Kiwako at a bowling alley, he overhears her boyfriend suggesting to his friend, Sawazaki, that he will "lend" Kiwako to him so that Sawazaki can finally lose his virginity. Ai appears to Hosono that night, but while he begs her to save Kiwako, he refuses to sell his soul in exchange for revenge. Kiwako later tells Hosono that she accessed the Hotline to Hell and has sent her horrible boyfriend to Hell. Hosono is shocked that she would agree to go to Hell for that and turns down Ai's help once and for all. At the end of the episode it is shown that Hosono purchases a blade, and plans to kill Sawazaki.