 If you liked
Mahouka Koukou no Rettousei
|
 ...then you might like
Grisaia no Rakuen
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Both of these animes center around an OP protagonist with a dark past who wants to live a normal life but external forces prevent him from achieving it. So, he is forced to counteract against them and save his friends. Some other similarities are-
- Emotionless and very skilled professional protagonists
- VERY close relationship with blood related sister
- Themes of terrorism and military involvement