The Secret of the White Kimono

"Kill your partner on your wedding night!" Sayoko Kujo marries Onizuki Yukimine, a noble family of munitions money. But, in reality, Sayoko is a false bride ; her true name is Ruri, a woman who lost her family because she was tricked by the Onitsuki family. As an assassin for the prestigious noble family Kujo Higashimaro, and to avenge her lost family, Ruri waits for the groom on his wedding night, waiting to attack....but...? Source : Pixiv