Yuu has left his parents' home and is nearing the end of his boarding school life, and graduation is fast approaching. He left home to shake off his feelings for his stepmother, Yuki, but as soon as he sees her waving goodbye and running up to him on the way home from the graduation ceremony, his hidden feelings quietly rekindle. That night, just the two of them celebrate their graduation, and Yuki lets loose and gets drunk, and Yuu walks her back to the hotel. Yuu tries to suppress his raging desire, but...