If you liked
NHK ni Youkoso!
|
...then you might like
Yesterday wo Utatte
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Both series follow protagonists who have yet to find out who they really are or where they really want to go in life. As the series goes on, both protagonists continue to grow due to the new friendships/relationships they obtain, finally discovering what they truly wanted in life all along. Both are slice of life/romance series. If you remove the otaku/neet element of NHK ni Youkoso it would look like Yesterday wo Utatte.
If you liked
Overlord
|
...then you might like
Tate no Yuusha no Nariagari
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Both isekai animes, that follow OP protagonists. Both protagonists have their own group/party, which includes a small harem element. The personality of the two main characters are different, however they both share a similar goal of saving their new worlds from evil.
If you liked
Deadman Wonderland
|
...then you might like
Tokyo Ghoul
|
Both series follow characters who are unwillingly given new strong powers. Both main characters are gentle at heart, but are later are forced to into a lifestyle of violence. Like Tokyo Ghoul, Deadman Wonderland follows a similar darker narrtive, along with some elements of action and romance.
If you liked
Cowboy Bebop
|
...then you might like
Megalo Box
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Similar art style and music background. Both series take place in a futuristic technological society. Both protagonists are extremely skilled at their trade, seeking a rematch against their rival.
If you liked
Black Lagoon
|
...then you might like
Jormungand
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The protagonists in both series find themselves trying to find a balance between right and wrong. Both series follow crews filled with members who have dark and detailed pasts. Additionally, both crews consist of highly trained mercenaries who deal their business underground or "behind closed doors".
If you liked
Btooom!
|
...then you might like
Yakusoku no Neverland
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Both series are focused on survival, and escaping their captors. Instead of children, the story of Btoom! follows older characters who are forced against their will to compete in a game of survival.