 If you liked
Kokou no Hito
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 ...then you might like
Ningen Shikkaku
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The portrayal of a man from his younger day to an adulthood as he struggles to be a part of the society and deems himself unable to. Both feature high quality illustrations that metaphorically depict the protagonists's inner state.
The Climber as well as No Longer Human are modern-day adaptations of older novels.