It's about this guy in his twenties who is very handsome and very smart but he suffers from a mental illness due to trauma fromwhen he was younger. As a result he copes by finding these hobbies. For example,Spoiler:He one day takes up magic tricks and learns it from this old man who works in a sewing shop (sells yarn). That's where he meets the love interest, the pragmatic daughter of his magic teacher.Spoiler:
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I hope that this explanation is detailed enough for someone to recognize it. I've been searching for it for so long I can't remember where I read it.