 If you liked
Kirihito Sanka
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 ...then you might like
Blue Phobia
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The two main characters are exposed to a certain ore or liquid that leads to their bodies getting malfunctions, leading to their eventual deaths, but not before turning them into a being that is completely pushed away from other humans.
*The psychological aspect is great in both, but because Blue Phobia is a one-shot, that one could have been deeper.