Since moving in with his older siblings, the first-year student has never had a peaceful day. From his seductive sister-in-law Suzuki always dressing provocatively, arousing desire every time she teaches him, to repeatedly witnessing sexual relations between the two siblings. In such an environment, and at an age of intense desires, it's understandable that sexual images always appear in his mind. When his tolerance reached its limit and he was constantly tempted and seduced by his sister, his craving erupted fiercely - as a result, an incestuous relationship between the two siblings was inevitable.