Yomi's and Nori's fathers have arranged their official engagement, despite the objections from her uncle since she was adopted into the Isayama family. His daughter Mei should, in his opinion, be the heir and carry Shishio, the Katana that hosts Ranguren that was entrusted to Yomi instead. Not only was she born in the family, but she is a talented Vanquisher, even stronger and surely more experienced than Yomi At the SDCD Headquarter, Yomi and Nori get into an argument over a trivial matter, which is something quite usual between the two. Having witnessed their latest fight and fearing their relationship could end, Kagura comes up with a plan to reunite them with the help from the entire SDCD division. But, although they constantly fight, Yomi and Nori's feelings for each other run deep.