 If you liked
Ikigami
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 ...then you might like
Yokokuhan
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Both of these manga deal with slightly different, alternative present world where government is rotten, system is bad and human lifes have little worth. Ikigami's protagonist realises it while working as part of the government maintaining it and starts questioning it, while Yokokuhan's is oppressed citizen who decides to fight it via terrorism. They give of the same vibe as they have similar style of narration, composition and art. If you liked one of them and generally like serious seinen pieces with more realistic approach storywise and in character designes you will enjoy both of these.