During a sweltering summer, high schooler Keigo watches over his beloved Ruri, noticing her innocent affection for him simmering into something far more heated. He decides it’s time to guide her into womanhood with passionate, intimate nights filled with tender caresses and ardent lovemaking. Keigo and Ruri explore each other’s bodies deeply, their loving connection transforming playful flirtation into a consuming, sensual romance they both cherish.