Happy Seven: The TV Manga

Synopsis

After viewing Kikunosuke through her magic skull, Kokuanten develops a crush upon him and a desire to see what is so appealing about school life, and decides to investigate. While there, she causes a few minor disasters before meeting Amano, who gives her a talisman to use for love, which she fights with herself about using. After she eventually gives in, the required spell is interrupted by a volleyball that Amano hit too hard. After running upstairs to apologize, Kokuanten reveals herself to Amano and a fight between her and the Happy Seven begins. During the fighting, Amano comes to the realisation that Kokuanten liked Kikunosuke, and before he could deliver the final blow, she placed herself in between them, her mysterious powers somehow blocking the blow, allowing Tomoya to "rescue" Kokuanten.

(Source: Wikipedia)