 If you liked
Alive: Saishuu Shinkateki Shounen
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 ...then you might like
Undark: Atarashii Toumei na Chikara no Subete
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ok the similarities are quite extreme, to the point where I suspect the undark author took direct inspiration from alive.
both series are about some comet or cosmic thing, causing a huge cascade with children suddenly gaining psychic powers.
both series start off with the protagonist suddenly experiencing powers and having their friend/sibling going mad with power after being granted it, then going off on a journey to search for their friend/sister, both series covers quite a few philosophical ideas about society and the meaning of life, in fact the protagonists in both series gets asked almost the exact question of what they wish for or
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