Three years after entering a boarding school at the same time as his father's remarriage, Hajime, on the verge of graduation, thought the faint feelings he had for his stepmother, Mihana, had completely vanished after his student life. However, on graduation day, seeing Mihana running towards him with a smile, he realized his feelings for her were rekindled. Hajime, his heart pounding with excitement for their private graduation celebration, desperately suppressed his lust for the unguarded Mihana as he escorted her to the hotel. But she gently kissed him, saying, "A present for the grown-up Hajime-kun." And so, he took another step into adulthood.
