She Is the Beautiful Girl in the School Year

One day, Kuroda Yusei, an introverted high school student with zero dating experience, returns a lost little girl to her house... when the most beautiful girl in his grade, Shirakawa Ayano, appears! *"As thanks for saving my sister,"* she begins to approach him boldly for some reason, and every day is filled with mishaps!? On top of that, a busty otaku classmate and an attention-seeking junior girl also appear, and his daily life suddenly becomes more glamorous!? A school romance comedy where fate changes as you suddenly become close to "the girl of your dreams"! (Source: Kadokawa, translated)