Her father is away on a company trip, and she has had a lot of sex with her stepmother, whom she has always admired, and is living a creampie life.

His stepmother, Sei, suddenly found out by Kenta after his father's remarriage. It didn't take long for Kenta, who was at his age to be attracted to the kind and intelligent Sei, as a member of the opposite sex. One day, his father was left home for three days on a company trip. Kenta was happy to be alone with his admired Sei, but in reality he was unsure how to treat him...