16
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신원: It's a fanmade MSA anime and manhwa.
배경: In Tokyo, Japan, an 18-year-old high schoolgirl named Satsuki was in the high school library reading a book alone while studying to become a scientist. Meanwhile, three high schoolboys named Junichi, Hayato and Atsushi entered the school's laboratory and saw a potion she made one that can turn people into little kids of all ages from 0 to 12. As soon as they touched it, it exploded and in that moment, they became little kids, Junichi became a 4-year-old, Hayato a 2-year-old and Atsushi a baby who babbles and coos using chopped words and crawls and she rushed up to see what was going on and saw the situation. . . What happens next?