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Makoto lives a school life while living in a dormitory. The fulfilling three years are over in a blink of an eye, and the graduation ceremony is finally over. At my parents' house, Mariko, a longing woman, remarried her father, so she rarely returned because of her awkwardness. However, on the way home, Mariko, who became her mother-in-law, suddenly came to celebrate her graduation. That night, at the accommodation, she gently kissed "a gift for Makoto who has grown up." Guided by his longing mother-in-law, he climbed another staircase to an adult ...