 If you liked
NHK ni Youkoso!
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 ...then you might like
Aku no Hana
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While the basic setting/environment of these two anime are different, they both have male main characters who suffer from anxiety and and considered on the fringe of society. The main female leads both have "contracts" and are centered around bringing the male leads out of their shells. Aku no Hana has a darker tone than NHK.
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Recommended by little_robot
In both of them, there is a "contract" forged between the MC and a girl. It relates to their inability to fully express themselves in society.
Dark themes all around.
MC is asocial, feels alienated by the people around him, wants to change but is not able to.
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Recommended by CrookedCucumber