Chu x Chu Idol (2007)

Kensuke is an ordinary uni student, living alone. One day, he happens to know Chiyu's secret. Chiyu transforms into a popular idol by kissing Chuchu, a vampire girl. Chuchu finds Kensuke knows their secret, and curses him not to stay away from them. As a result, they start to live together... Will he be able to get rid of the curse?