Kanna, a nurse, married a man who is two years older and has a child from a previous marriage. Although they were living a happy married life, there was one thing that made her anxious: her stepson Taichi. After graduating from university, Taichi got a job at an IT company. However, since the company was a black enterprise, he quit soon after and is now a hikikomori… Thinking she must do something as his mother… A young and beautiful woman who is closer in age to her husband than she is entered their previously female-free home, offering help with job hunting and lectures, causing Kanna's irritation and sexual desire to explode…
