Renta, who has just enrolled in a university in Tokyo and started living alone, was raised by his grandmother, Erio, since childhood, filling the void left by his absent family. His father, constantly traveling across the country for work, left Renta to grow up in solitude. Three years ago, his grandfather passed away, and Erio, now aging and living alone, gradually grew overwhelmed by pent-up desires. When they reunite after a long time apart, she finds herself irresistibly drawn to her grandson Renta's body. Blurring the lines between cherished memories and the present moment, their forbidden bond deepens.