That's a good thought. The one I had myself was that her sister could be a heart breaker kind of character.Maybe the issue is not (pseudo)incest, is that Kawase’s first love was “stolen” by her sister.
(A.k.a her crush had a crush on her sister)
Reading this Twitter bio is like opening ur mailbox to a pipe bomb what did I just read"Please don't fall in love with my sister or I will cry"