"Fruits Basket #7" by Natsuki Takaya (Preowned Paperback)

Tohru Honda, an orphaned high school freshman, is invited to stay with the mysterious Sohma family in exchange for cooking and cleaning. She soon discovers the family's great secret...its members are possessed by the spirits of the Chinese Zodiac, and when they are hugged by members of the opposite sex, they transform into their Zodiac animal!