Married for 16 years. Recently, my husband and I haven't even spoken, and I've been living a hollow life. Among that, the only joy I have is taking care of the ronin living next door, Masuda-kun. He seems sincere, and there's something about him that arouses my maternal instincts... I'm gradually being moved by him, who genuinely rejoices at what I do, and I'm having an affair for the first time in my life. And with a younger man at that... I know it's wrong. But I can't help but feel joy at the fact that a naive boy is seeking me out...