Ichinensei ni Nacchattara - Ooi, Masakazu

While on his way to school to confess his love to classmate Kusanagi Mikuru with a love letter, high school ninensei (2nd year in highschool) Takatou Iori gets run over by a truck to save a cute elementary ichinensei (1st year in elementary school) schoolgirl.
But when he wakes up, he's revived by a perverted doctor, as a full fledged female elementary ichinensei student and is now in the same class as the girl he saved.
(Source: MangaHelpers)

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