@Solipsist I use both my phone and paper. Sometimes using a pen is just faster and you can draw something in place of a gesture. TTS is just the most awkward thing ever and I'd only resort to it if someone was blind
@Podi125@peppers she does know sign language. if you look at "the mute girl and her new friend" in the related section, it's the pre-serialization of this. and it shows she uses sign language when the teacher wanted to connect to her in chapter 9.
It's a rare detail in a gag manga like this that they actually saved up those infinite "gag" items that appears outta nowhere (in this case, the notebooks). That's quite a lot of notebooks.