Thriving on the euphoria of a sincere kiss shared with her familiar Tomoe, Nanami Momozono feels invincible in that instant. That illusion shatters when she sees Tomoe accept a shadowy black box and declare that with it he no longer requires Nanami. Crafting an impeccable distraction, she resolves to uncover the contents of that mysterious package.
After Nanami intercepts her familiar Mizuki remarking that Tomoe might be overindulging her, she is driven to prove her self‑sufficiency. While journeying with Tomoe to a hot‑spring inn, where steam rises and the air smells of pine, Nanami discovers a legend about a stone that supposedly bestows eternal bliss upon couples who touch it together. Yet the arduous trek to reach the stone could be daunting, especially if Nanami declines Tomoe"s assistance and remains stubbornly independent.
