Hiroshi, his only son, is remarried to a woman 20 years younger than him, and his father ends up living with his stepmother Akari. Hiroshi tends to be a retreat and not be a nuisance at work, but he can't hide his excitement at his life with Akari, who is only five years apart. One day, while cleaning, a voltage of excitement reaches Max when he sees a glimpse of his panties from Akari's skirt... From that day on, Hiroshi is sulking down by Akari's seductive charm...
