Mizuki moved to Tokyo for her exams and ended up imposing on her aunt's house. Her aunt lived with her cousin, Misuzu, who was older than Mizuki. Mizuki had only met Misuzu a few times as a child and hadn't seen her in over ten years. When they met again, Misuzu had grown into a mature woman. Misuzu stared intently at Mizuki. Before long, Mizuki began to take notice of Misuzu. And then...