If you liked
Chuunibyou demo Koi ga Shitai!
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...then you might like
Ore no Kanojo to Osananajimi ga Shuraba Sugiru
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In both anime, the main character had "chuunibyou" in the past, which ends up bring up troubles when he goes to high school, in Chuunibyou having another classmate relive his chuunibyou times, and in Oreshura it was used to blackmail him. And in general, many scenes that happened in Chuunibyou also has similar scenes happening in Oreshua (but in a shuffled order). Note that Chuunibyou is more focused on the chuunibyou itself, while Oreshura is much more romance-oriented, thus making it a harem as well.
If you liked
Gakkougurashi!
|
...then you might like
High School Fleet
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Both of these are moe CGDCT slice of life shows... Oh wait, finish the first episode, and you'll see that this is not true at all. These have bait first episodes, and are really about girls fighting for their lives, with those in Gakkougurashi thriving in a zombie apocalypse, while those in High School Fleet having to deal with a constant bombardment from other ships, with both still having its SOL/comedy moments. There are other similarities, like the presence of an significant animal, and a main character being separated from her friend, but these are relatively minor. Any more similarities would be spoilers.