The Heart Thief of Valentines!?

Synopsis

Ijūin Tōru, an underclassman, is a handsome boy popular with the girls. His classmate Kanako, who has a secret crush on him, one day tried to lend him her English notebook and ended up handing over a book of love poems she'd written herself. To save the maiden from disaster, Saint Tail issues a calling card declaring she will steal Tōru's "notebook." But by accident the card ends up reading that she'll steal his "heart" — leaving Asuka Jr. with mixed feelings.