Like one of the many reasons Hina rejects Kisaki is because she's still pining over a guy she dated for a few months in middle school. There's several timelines where she's still upset that they broke up or someone mentions she still liked him. Like girl, you don't have to marry Kisaki, but move on.
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I want to know what Kisaki would have done in that situation. (Obviously murder, but I want to see how he'd do it)