In the final kill – “Of Kill, Me, and Baby,” the latest thing to catch Yasuna’s interest is cop shows on TV. She brings “toy” handcuffs to school and after cuffing herself to Sonya, breaks the key. Sonya finally slips out and cuffs Yasuna to a tree. Yasuna then guesses Sonya’s birthday is near, and arranges a party with Agiri, who must be assembled from three boxes in the right order (when they don’t later on, it’s not a pretty sight).
The crime theme returns when Yasuna learns Sonya is going off to do a job, and tries to stop her. She falls into a trap, but drags Sonya in with her. When Sonya leaps out, Yasuna makes an impassioned plea not to leave her and not to kill anyone else, as it may negatively affect their friendship and disallow her from continuing the hijinx of the last thirteen episodes.
Sonya lowers a rope for her. As much as Yasuna antagonizes and annoys her, Yasuna’s tearful words move her: she doesn’t want things to change. She wants to keep being teased by Yasuna, and she wants to keep hitting her in retaliation. Perhaps not the healthiest friendship, but a solid one nonetheless.