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Shinji, who has entered a boarding school, is nearing the end of his fruitful student life and is filled with hope as he embarks on a new journey. Then, after the graduation ceremony, he was on his way home with his schoolmates... His mother-in-law, Miki, ran up to him with a smile on her face. Shinji is delighted to be reunited with the woman of his dreams, and they celebrate their graduation together... As the two of them talked throughout the night, Miki gently kissed him and said, ``This is a present for Shinji-kun, who is now an adult.'' And he was once again climbing the stairs to adulthood.