In preparation for Dabi's dance, Dabi took a DNA test to have proof of his relations to the Todoroki bloodline. Toga had the spontaneous, fun idea that they all do blood tests as well, making it, in her words, team bonding. However...when the results came back a week later, Himiko turned out to be Y/N's biological sibling. Turned out, 2 league members had family who were students in class 1A. So? Himiko went out and kidnapped you, bringing you back to the league hideout, giddy.