When I delivered a lost girl to my house, the one who came out from the front door was a beautiful girl of the first grade (1) / Ajalachinana

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One day, Yusei Kuroda, a high school student with 0 love experience, delivers a lost little girl to her house. Ayano Shirakawa, the beautiful girl of the first grade, appears! "Please do anything for me as a token of my gratitude for helping my sister?" From that day on, somehow, she began to approach me boldly? In addition, she was pushed by big otaku classmates and Kamattechan junior girls, so it will become a gorgeous daily life at once?