While my wife was away on a business trip, my sister-in-law, Azu, seduced me and we had intense creampie sex until I emptied all the sperm I had saved up for 30 days... Azu Amatsuki - Amatsuki Azu

The movie revolves around the narrator, a married man whose wife is often away on business trips, leaving him alone and vulnerable to temptation. His sister-in-law, Azu, takes advantage of the situation and seduces him, leading to an intense and secretive affair. The central dramatic tension lies in the moral conflict and guilt faced by the narrator as he navigates his desires and the consequences of his actions, all while maintaining a facade of normalcy in his marriage and relationship with his sister-in-law.