 If you liked
Boku dake ga Inai Machi
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 ...then you might like
Kimi ga Shinu Natsu ni
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Do you like mystery manga involving time loops and rather clever protagonists on a mission to save someone? Then you'll have a lot to enjoy in both Kimi ga Shinu Natsu ni and Boku dake ga Inai Machi. I know I definitely did.
These two titles have reasonable lengths at less than 50 chapters each, so binge read for best results; chances are you'll probably be on the edge of your seat anyway, so strap in for the ride.