 If you liked
Oyasumi Punpun
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 ...then you might like
Ningen Shikkaku
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Story of a depressed young adult with existencional crisis and how the interactions with others influence his life (mostly not in a good way), including family and attempt at romantic relationship. In both works the psychological state of the protagonist is expressed using amazing illustrations.
Both Manga are dark takes on coming-of-age genre. They handle heavy topics and are not afraid to step into surrealism realm.