So I found a story where the author combined two popular shits: waste war god son-in-law and ultraman. It's called "奥特赘婿", and the summary goes something like this: "To repay a debt of gratitude, the war god Zoffy conceals his identity and marries into the Fang family, pretending to be weak while secretly plotting against them. However, he always feels there's something slightly strange about his wife."

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