There was an apocalypse happening and one girl (ig she's still a kid) turns into this bunny suit? Like a zip up suit kinda. I think they considered her a monster but she was on her right mind. It's been over 5 years since I've read it so I don't remember vividly sorry.
sounds like it could be either
https://www.mangago.me/read-manga/pygmalion/
https://www.mangago.me/read-manga/gleipnir/
Your description reminds me a of Gleipnir, but as far as I remember, there is no apocalypse and the person who transforms into a mascot suit is a boy. https://www.mangago.me/read-manga/gleipnir/
I somehow teared up reading this. It reminded me of back when I used to play games a lot. It really hit home. I have a friend there exactly like Boomie, apart from the idol stuff, and I feel so similar to Chyaru. We were always together that it became weird when others don't see us together. It made me feel like visiting the game again although i already quit. We aren't as close as we used to be anymore. he doesn't talk much let alone give personal details but we still talk outside game. I treasure him a lot I wish he treasured me the same. We argued a lot cuz of misunderstandings but at the end of the day he's always the first one to know small things about my day. I miss how close we used to be. I get jealous when he talks about his friend cuz I used to be his closest friend i dunno about now. But people change and we changed. I'll read this again whenever I miss us, A.
Wait omg. Me too. I had a friend on codm and we were so close until misunderstandings came up, we still talk but not as much