After their mother passed away, Hikaru Minazuki lived alone with her father in a small family household. Her father worked tirelessly to support them both, while Hikaru grew up watching him and developing strong feelings beyond those of a daughter towards him. To cope with these emotions, she would masturbate every day to find solace. However, when her father mentioned remarrying one evening, all of Hikaru's pent-up desires erupted out of control!