 If you liked
Owari no Seraph
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 ...then you might like
Kimi Shi ni Tamau Koto Nakare
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In both mangas students are used as weapons and are made to fight against ‚evil‘ with their extraordinary abilities. In ‚Thou shall not die‘ as well as in ‚Seraph of the end‘ they develop some kind of friendship. By comparison ‚Thou shall not die‘ shows more brutality and belongs to the seinen genre while ‚Seraph of the end‘ has typical traits of the shounen genre.