Yu has been living in a dormitory at a school far away for three years.And on the day of the graduation ceremony, which marks the end of her school life, her mother-in-law, Marina, runs up to him with a big smile on her face...That night, she celebrated her graduation with just the two of them, and she was so happy that she drank too much that she passed out.She gave him her graduation gift, and she gently guided his hand to her chest.While being guided by her longing mother-in-law, Yu climbs the adult stairs again.