 If you liked
Watashi no Messiah-sama
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 ...then you might like
Ichiban Ushiro no Daimaou
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Not only do they share a common length in titles... But in both there are these two normal guys, but later they both find out that they are both destined for something great in Ichiban Ushiro no Daimaou; to become a Demon King and destroy the world, In Watashi no messiah-sama he finds out he's suppose to be the Messiah and save a world; I recommend both manga they're both great