A lot was said this episode but it can be summed up in a few sentences, which I will attempt to do. SPOILERS, I failed.
We resumed the episode right where we left off with Shisui’s surprise visit. To her it felt like she’d woken up from a very long sleep, her eyes opened and having a newfound appreciation of life. She also mentioned their meeting not being a coincidence. Mangetsu mentioned Kuon and while Shisui had sadly forgotten about her…her heart had not. This moment sparked an epiphany in Mangetsu.
As Ernesta held her doll and reminisced of what could have been between Anna and her she got a message from Mangetsu. She was about to apologize for something but Mangetsu beat her to it, asking if it would have been better had she never existed. Ernesta rushed over to their meeting point, apologizing for Mangetsu essentially being created to comfort her in her time of confusion. Someone to be there for her as she tried figuring out what it was she wanted from competing in GRANBELM. Mangetsu didn’t mind. In fact, the aforementioned conversation with Shisui and another moment at a snack bar with friends helped her realize that although certain GRANBELM mages were pretty much erased from existence they weren’t entirely forgotten as Shisui and her classmate showed. This epiphany helped her appreciate life all the more despite being a “doll”. She was more determined than ever to help Ernesta fulfill her wish of erasing all magic. It’s at this point for most viewers that Mangetsu’s goal became clear.
Later the two went to Nene-Nee’s pad to make a request. Mangetsu wanted everyone to go camping before the Final Night. A lot was said and expressed but it’s best seen to be appreciated. Let’s get to the heavy stuff.
So yes, Mangetsu had decided to help Ernesta win at the cost of her life. When Ernesta figured it out she of course tried pleading with Mangetsu to let her help find a way to keep her from disappearing but she was like “No. It must be done. Magic must be erased from the world so that humanity can open their eyes and learn to appreciate the world around them. Though I’ll disappear when this is over I’ll live on inside your heart, my love”. The last two words were added but she clearly expressed that sentiment. We all know these two are lovebirds cursed by fate. Ernesta obviously was torn inside but time had run out for the Final Moon rose. It was time to take down Suishou and the Magiaconatus.
I shed a tear this episode. Hopefully the subtitle of this show isn’t misleading and our heroines find a way to live together.