Ninja to Koroshiya no Futarigurashi - Episode 11 - Yukari Card Flips
Yukari was the first rogue ninja hunter that Satoko had successfully fought off, which her playing card hints at how she did it.
Konoha’s time as a baby (whom Satoko cared for and raised) changed her personality. She called Satoko “Mommy!” Yukari, the casino bunny ninja, chose the perfect time to take out the assassin who always protected the rogue ninja.