I'm not sure how many people know about it, but JP recently had an update where they actually rewrote a lot of area convos. Including ones between Sayo and Hina (now there are no convos where Sayo's being outright mean/cold towards Hina, as compared to the original ones.) Here's an example, the guitar scene from Edogawa Music. The original version is like this:

But the current version on JP is like this: Sayo: Hm? This guitar is...

Hina: Hey, Onee-chan! This guitar is super cool! And so boppin', too!

Sayo: Boppin', yeah... Hehe.

Hina: Hmm, what? What's up, Onee-chan?

Sayo: Heh, it's nothing.

Hina: No, tell me~! Now I really wanna know~!