The episode explains that her "blessing" (which causes those around her to kill themselves) stems from the intent of others; Deathtopia could only turn her because she viewed it as saving her, not harming her. 3. Bakemonogatari (2009)

Deathtopia renames Princess Acerola and turns her into a vampire at her request.

"Tsukihi Phoenix, Part 1"This episode is infamous within the anime community for the "toothbrush scene".

Depending on which "Monogatari" series you are referring to, the eighth episode varies significantly. The most likely match for a standalone "Monogatari" title is the 2023 anime , but I have included details for other popular entries in the broader Monogatari franchise as well. 1. Malevolent Spirits: Mononogatari (2023)

[Rewatch][Spoilers] Monogatari Series - Bakemonogatari Episode 8