that time I visited my brother in another universe!

rimuru tempest a strong independent non binary leader without siblings. Well that was wrong she had one one brother in another universe she knew he was weaker than her, in fact... he was weaker than a lower class demon in her verse which was S class in his. problem is, is that he doesn't even know that rimuru or...in his universe rim is even his sister. but when rimuru gets an anonymous letter that his life is on the line she decides to finally , finally see her brother. at the yyh verse

note : she is really calm and smart she is also way more op since i need it for more sufficient plot im sorry to all the og people :( also rimuru will also have a dark side when people she loves are in danger