 If you liked
Boku dake ga Inai Machi
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 ...then you might like
Ano Natsu.
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The premise of both stories is time travel involving an adult(s) being thrown back into his or her childhood in order to prevent a tragedy from happening. They both have a similar, serious feeling to them and deal with some heavy topics at times. Some of the differences are that Ano Natsu involving s several people going back in time, and has a butterflies on romantic relationships. In Erased, only the MC is aware of the time change, and the bulk of the story takes place at a younger "age" (revisiting elementary school, versus high school). Both are well written and worth reading.