it's rare case for manga, I got cry a lot from anime (you know, sad BGM effect).
But I'll go with "Specific Heat", oh gosh it's simple yet beautiful. It's manhwa actually http://www.mangago.me/read-manga/the_specific_heat_capacity_of_love/
and "Hybrid Child"(/TДT)/ http://www.mangago.me/read-manga/hybrid_child/
I don't have a ball to re-rea......
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