Need help finding this anime

[Finnstartsfires]

I found it like quite a while ago (like years) and I only read a few pages so this description is gonna be terrible. I think it’s about this dome where when you go inside you k1ll monsters so get like money and stuff and this little girls wants this red dress for her mum or something so she goes into the dome and meets this guy who’s really good at sh00ting and he ends up getting it or something I don’t remember if he gives it to her or not but yeah, and like life outside the dome is pretty trash as well. That's all I remember sorry, also it's not Gantz

[AXES]

Yeah I seen that.. also has people in bunny suits, ninjas and all sorts of skilled killers, all out to kill each other till one is left.. Let me get my anime list out and get it too you.

[AXES]

check out.. "Danganronpa" that might be the one.. it starts out odd, but, it fits what you said.
hope this helps.

[AXES]

https://www.youtube.com/watch?v=uGtAU2WVnms&t=9s

[AXES]

and the other is...JUNI TAISEN : ZODIAC WAR

[AXES]

https://www.youtube.com/watch?v=zRuByytp8sA