1-gatsu ni wa Christmas
English title: Christmas in January
Japanese title: 1月にはChristmas
Alternative titles: Ichigatsu ni wa Christmas
Type: OVA
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Nov 21, 1991
Duration: 45 min
Rating: G - All Ages
Studios: Magic Bus
Producers: Omnibus Promotion
Genres: Drama, Romance

During a snowy day just before Christmas, Mizuki Tateno, a girl with a twisted personality, moves into the house next door to university student Fujioka Junsho. 
Mizuki says "I hate Christmas". Why does she hate Christmas? Why does she have to live alone in a big house? An incident occurs right after Christmas and Mizuki's past is revealed.

(Source: Wikipedia, translated and edited)