Im looking for a manga about a high school student that saves a kid from getting hit by a truck and he is saved by a perverted scientist with a loli fetish and turned him into a little girl

Pretty face?

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Its not pretty face i should say that the scientist is female and lives with her sister that the main character has a crush on they also send him to grade school

Ichinensei ni Nacchattara - I think this is it

Yes Ichinensei ni Nacchattara was the one thank you very much for helping me