What is one of the worst things that can happen to bride on her wedding day? Saying to bride to carry on with ceremony alone so that her “dear” unfaithful husband can be as irresponsible as ever. (they have already signed the marriage certification). What prevented her from divorcing him that very same day was her brother-in-law Soujirou acting as stand-in vowing:

I vow a thousand, a million times…. never to let you leave my side.