 If you liked
Forest of Gray City
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 ...then you might like
Watashitachi no Shiawase na Jikan
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Both of these manga have similar feelings to them. In both stories the characters are searching for meaning and have gone through psychological trauma or have been hurt in some way. They both show the need for companionship and show the healing that the main characters bring to each other. They are both very touching(practically life changing for Our Happy Hours) stories and have beautiful art.