Yu has lived in a dorm at a distant adult vocational school for three years. On graduation day, his stepmother Marina runs up to him with a beaming smile. That night, they celebrate alone, but an overjoyed Marina drinks until she passes out. After Yu helps her back to their lodging, she offers him a graduation gift by gently guiding his hand to her breasts. With the stepmother he has always desired leading the way, Yu takes another step into adulthood in this adult stepmother-and-stepson role-play.