Black Clover, Grimoire- Space-Time or other Laws such as Life and Death etc, considering we dont know what being she inherited from...
And Yuri with Nero, or Yuri with someone from another world she goes to.
with the whole grimoire thing, i thought it'd be black clover but, but I'd love to see familiar of zero with what you're doing so far. great first chapter
eh while catgirls may sound nice and all I personally don't like them much (especially for a MC) that's just my opinion though
also it said multiple worlds right? would be cool if she visited or is in grimoire of zero