Episode 1: A straight laced Christian man in his early 20s, by some lapse of judgement, is talked into drinking with a friend and ends up completely inebriated. Consequently, he has a blur of a one night stand with a cynical woman somewhat older than him, who we'll later find out is a destitute soul with a crack habit (among other too numerous sins).
Episode 2: The next day, the two wake up, and upon realisation of what has occured, the man (helped by the woman's lack of a real place to live) convinces the woman to stay at his place, and try be a real, couple.
Episode 3-26 + OVA specials: Whacky slice of life hijincks ensue as the good as gold churchgoer heads off against the drug fiend, trying to pull it together despite their differences. In the last episode we find they'll have a baby, and then fade to white.