I'm looking for a specific type of time jump manga where he main character either goes forward or backward in his/her own life, but keeps the same maturity. A standard layout is where maybe there's some type of accident, and the mc wakes up in her 5-year-old body and maybe has to relive her life. I really want the mc to keep his/her intelligence, (maybe) memories, and maturity.
Two examples: where an adult has to relive her high school days, there's The Country is Saved!. Not excellent because she's a little foolish (and therefore doesn't seem grown-up enough to me; her high-school self blends in with the other high schoolers). On the other side, the second oneshot in Itou-san is a case where
Spoiler (mouse over to view)
the mc's boyfriend is a child who skipped ahead in life to become an adult.
Bonus points if history/the future is somehow changed because of this reliving. That would be awesome.
No yaoi, yuri, or hentai please.
Thanks!!