When Yuu-chan plays an RPG, she's the type that overlevels and obtains powerful weapons from the casino that you wouldn't normally get in the early game in a regular playthrough, so she becomes overpowered.

I overkilled him, so why is the rival surviving like this...

What, is that all you got?

Kuh... So I can't win with how I am now... blagh (spitting up blood)

I even won without taking damage, so why is the main character spitting up blood...

.....This makes no sense.