If you liked
Ano Hi Mita Hana no Namae wo Bokutachi wa Mada Shiranai.
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...then you might like
Nagareboshi ni Negau hodo Bokura wa Sunao ja Nai
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Both of these are dramas where an important friend from the past appears again. They're about a group of friends who are no longer as close as they once were because of a tragedy that happened.
If you liked
Psyren
|
...then you might like
Darwin's Game
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Both contain games where they are teleported and then have to battle other participants and enemies. They gain supernatural powers as well.
If you liked
Again!!
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...then you might like
Hoshino, Me wo Tsubutte.
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Both have a main character who is reclusive and has a tough time at making friends at first. Both are comedy, romance, school life, and shounen.
If you liked
One Punch Man
|
...then you might like
To Be Hero
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Both have a unique superhero mc, wacky comedy, and wacky alien bad guys.
If you liked
God Eater
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...then you might like
Phantom of the Kill: Zero kara no Hangyaku
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Both have a male main character with special powers that battle the monsters that populate the dystopian worlds.
If you liked
Cross Ange: Tenshi to Ryuu no Rondo
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...then you might like
Valkyrie Drive: Mermaid
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Both have female main characters being sent off to an island because society doesn't like their kind. Cross Ange has slight yuri and ecchi while Valkyrie Drive has much more. Both are action anime.
If you liked
Gantz
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...then you might like
Imawa no Kuni no Alice
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Both main characters get sent to a place where they have to play a deadly game to survive.
If you liked
To LOVE-Ru
|
...then you might like
Kiss x Sis
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Both are harem, ecchi, comedy, romance, and school. Both have clueless main characters, though To Love Ru is even more clueless. Both main characters think their sisters are attractive.