Makoto lives in a dormitory and lives his school life. Three fulfilling years come to an end in the blink of an eye, and finally his graduation ceremony comes. At home, Mariko, the woman he admired, remarried his father, and due to the awkwardness, he hardly ever went home. However, on his way home, his new stepmother suddenly comes to visit him to celebrate his graduation. That night, at the hotel where he is staying, she tenderly kisses him, saying, "This is a present for you, Makoto, now an adult." Guided by his admired stepmother, he takes another step towards adulthood...