Hajime entered a boarding school at the same time as his father's remarriage and was about to graduate for three years. I thought that the faint feelings I had for her mother-in-law, Mika, had completely disappeared after her student life, but... Then, on the day of her graduation ceremony, when he sees Mika running toward her with a smile on his face, he realizes that his love for her has risen again. Hajime is excited about the graduation gift for just the two of them, and desperately suppresses his evil desire for the defenseless Mika as he takes her to the hotel, but she gently kisses him and says, ``This is a present for Hajime-kun, who has grown up.'' …. And he was once again climbing the stairs to adulthood.