Yu lived alone at a boarding school, and though his days were fulfilling, they eventually came to an end as graduation day finally arrived. Feeling a bit lonely, he began his journey home, only to be unexpectedly greeted by his stepmother, Kazusa, running toward him with a bright smile. Overjoyed at reuniting with the woman he had long admired, Yu's heart swelled with happiness. That night, the two shared a special, intimate celebration of his graduation. Filling the emotional gap left by their time apart, they opened their hearts to each other in deep conversation. Then, Kazusa whispered, "For you, Yu, now a grown man—this gift from me," gently pressing her softly moist lips against his. On this day, Yu would once again take a step forward into adulthood.