Yurika Aoi became pregnant during her school days and has raised her son as a single mother after divorce. Now that her son has entered university, they combine their part-time job savings for a hot spring trip together. The son has long desired his mother as a woman. Eventually, he confesses his love and makes his move. Their familial bond crosses into forbidden territory as illicit emotions awaken. Though initially resisting, Yurika begins to waver as he sucks her nipples and caresses her private parts. Overcome by pleasure she hasn't felt in years, she loses control, giving in to desire as they passionately entwine again and again. A taboo incest story where maternal bonds and sexual attraction intertwine.