My childhood friend Sae-chan has returned to this town after a long absence. It's been over twenty years since we last met, and my heart is pounding with excitement. We used to be so close—we'd bathe together, sleep together, share everything. Now that she's past 40, I find myself overwhelmed with the desire to have sex with her again after all these years. Sae-chan has divorced, moved back to her parents' home, quit her job, and has plenty of free time on her hands. We were even in the same class with one other friend, growing up side by side. This time, the long-awaited reunion with my childhood sweetheart is charged with anticipation—two adults over 40 about to experience sex together for the first time.