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I'm trying to find a manga that I last read in like 2023-2024. The MC was the youngest of three princes in a small country that was on the verge of collapse. His two older brothers are trying to help the country in their own ways (getting help from others and strengthening the military) but neither is working. He ends up learning alchemy (which is forbidden by other stronger countries) and he's using it to help rebuild his country. Somebody PLEASEEEEEEEE help me find it.
also he has a younger sister who helps him with cooking stuff and a red-haired guard/gf