Tou-san no Kaeri ga Osoi Kara...

A young girl finds herself alone at home as her father is late returning from work. Bored and curious, she begins to explore her surroundings, stumbling upon things she doesn't fully understand. Her innocent actions lead her into a situation that blurs the line between childhood naivety and adult desires.

As the evening stretches on, her solitude is interrupted by an unexpected visitor who takes advantage of her vulnerability. What starts as a simple game quickly escalates into a taboo encounter, forcing her to confront feelings and experiences far beyond her years.