Instant Teen: Just Add Nuts Series by Haruka Fukushima

Meet Natsumi Kawashima, a homely fifth grader with a craving for curves of her own. One day, after eating a packet of mysterious pink nuts, her wish comes true and she is transformed into a beautiful, sexy woman! Now endowed with a mind for recess and a body for supermodel glitz and glamour, will Natsumi find happiness or heartbreak as a result of her newfound adulthood and sudden legion of fawning admirers?

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One day after eating a packet of mysterious pink nuts, Natsumi Kawashima is transformed into a beautiful, sexy woman. Will her newfound adulthood and sudden fawning admirers lead to happiness or heartbreak?