If you do the "lock in your love at a bridge" thing you are not allowed to break up until you dive into the river, get your key back and unlock it from the bridge.

Opinions about isekai that the public is not ready to hear: There are shows in the isekai genre that are technically not isekai and there are shows that are technically isekai that are not in the isekai genre. All genre names are bad and misleading theory staying strong.