Tbh that kinda felt like the ending to the manga. Also, I hope the fourth wall break has some relevance to the actual story and wasn’t just thrown in there.
believe it or not, i have seen many type of manga, like fukushuu o koinegau, nidome no yuusha, etc and usually i kinda feel bad for the many antagonist, but this is the first one, that i got really scared to the main antagonist aka her sister to the point where i would say "don't look into my eyes you psycho"