The Magical Girl and the Evil Lieutenant Used to Be Archenemies — S1 E7 - They're Friends...?

Hibana and Byakuya were friends. Seeing Hibana express her joy at their reunion with a lariat, Mira is a bit bewildered. Byakuya, who had been told by the messenger that she was disqualified as a magical girl, readily accepts it, though she doesn’t want to quit.