Living with my beloved aunt for three months, her nephew Ataru gradually began to discover her true nature. One day, he witnessed a shocking event—his aunt brought a secret lover into the house. In that instant, Ataru saw the real side of her he'd never known before, and his heart was deeply shaken. However, behind this incident lay his uncle's own infidelity, and a new, intimate relationship begins to blossom, filling the emptiness in Ataru's heart.