I'm Gonna Be An Angel (Vol. 1)

The original Japanese title is 'Tenshi ni Narumon!', which roughly translates to, 'I'm Gonna Be an Angel!'. Yuusuke, a high school boy, is on his first day of living by himself, and he's quite happy about his freedom. On his first day alone, and on the way to school that morning, no less, he 'stumbles' across Noelle in the woods. She is naked and unconscious. Suffice it to say that when Yuusuke lands on her, he accidentally kisses her, and this of course wakes her up. She immediately assumes that Yuusuke is now her husband (so will her family). Yuusuke runs away in a blind fear, but his problems have just begun. Noelle, who just happens to wear a halo, is now a student in Yuusuke's class and her 'family' has moved themselves (and their entire house!) to the spot where Yuusuke's house had been. Yuusuke has a crush on another girl (Natsumi), even though she won't spare him the time of day because of several unfortunate and embarrassing incidents. It is during his attempt to apologize for one such incident that we hear Yuusuke compare Natsumi to an angel - Noelle, upon overhearing this, later pledges to become an angel for Yuusuke. The series centers upon this pledge and how everyone handles the consequences it creates.