 If you liked
Ichinensei ni Nacchattara
|
 ...then you might like
Return
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Nacchattara has the male protagonist change from a male 17-year old into a female first-year elementary schooler as part of surgery to 'bring him back to life'. Return's protagonist also gets killed in a car accident and finds himself in a female body, though Return explains this through spiritual means.
They share essentially the same premise, but Return is far more drama-heavy and peppered with comedy elements, while Nacchattara is a light-hearted, comedy-centric manga peppered with drama elements.