English name is My Little Sister Can't Be This Cute. And it's fucking wincest to the max.
Had to google wincest but the sister is the only who could fit that category really fits. The brother himself only sees her as a sister and I think makes that quite clear, I have sisters and everything he doe in my book classifies as family love nothing incestful. The sister on the other hand >_> I can not defend too much
asdf