Chokotto Sister

as a child, kawagoe haruma eagerly awaited the birth of his little sister. however, his mother had a miscarriage, followed by an operation that left her unable to bear children. that christmas, haruma made his christmas wish. it was a wish so innocent and heartfelt that it was accepted instantly, unbeknownst to him. many years later, on christmas morning, college student haruma is awoken by a woman riding a hovering motorcycle and claiming to be santa claus. she throws him a bag, and he opens it to find his new little sister! complaining to santa claus that he made this wish a long time ago, she tells him that it takes much longer for a sister than it does a toy car. after naming her choko because of the anchoko (mini-guidebook) she carries around, they begin their new life as brother and sister in a crazy apartment building filled with interesting neighbors.