Trying to find a specific manga

Secret October 30, 2023 5:47 pm

My brother told me about it but he forgot the name!
He said it's about a brother and sister were the sister needs an organ donor within 30 days. The brother is praying to God to give them an organ in time and the hospital calls and says they got one! The twist is the day keeps repeating smh(Groundhog day level). Both brother and sister are repeating the day but it's worse for the sister because her condition progresses. The solution is finally found accidentally when the bro is confronted by one of his bullies and kills him. He needs to keep killing in order for the days to continue as normal.

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