御曹司との結婚が決まった両親が溺愛しまくる穀潰し妹→即お祝いに駆けつけたら俺以外全員破滅したw【スカッと】【修羅場】

[Synopsis of this video] My younger sister had always been allowed to do whatever she wanted. Even though she didn't work and only played around, our parents always doted on her. Then, suddenly, news arrived that she was going to marry the heir to a wealthy family. Our parents were overjoyed. It was a huge celebration, as if the whole family had become winners. Then I got a call too. "Make sure you come to your sister's wedding celebration!" But at that moment, a certain truth that no one had imagined was revealed. The celebratory mood in the venue changed instantly. Before we knew it, the entire family, who had been so relaxed, were pale-faced. What was the truth behind the marriage that everyone thought was a guaranteed success?