Hekikai no AiON
AiON

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Both are drama manga's with comedy and horror. The main heroin in both manga's can't die. In AiON, there is a little romance, in Sankarea it is a bigger topic. 

The starting point is quite similar since in both titles the MC is a girl who has to fight against monsters using a spirit sealed within her body. There is quite a bit of horror in both, with dismemberment pretty common in Ga-Rei and more "psychological" violence in HnA. The main differences can be found in the character design: Ga-Rei is more realistic than HnA but they both share a dark atmosphere in the whole design.  

The female protagonists of both have a very odd and detached sort of personality. They are also immortal. Fairly average guys follow them around. The atmosphere of the two is very similar as well. If you liked the premise of one, you'll enjoy the other.