Starting on chapter 1 and shown again in this chapter, there's this recurring 5 color motif on the title page
Might be foreshadowing of 5 different girls/4 and Naoya
I was really dumbfounded on the focus change (even if several people that read the LN had already mentioned it), but this was set up as early as Chapter 5 (page 18). Considering how the author took the time to mention her attending a magic school and the prospect of the mechas, this was...
"Total strangers just barged into my house, kissed, confessed and now are talking about killing us...!!! What am I going to do...?!"
I want to read that light novel
Only some individuals are both deaf and mute
However, deaf people commonly avoid speaking, since they can't regulate their volume and tone compared to someone that can hear themselves. Their voice is usually unmodulated and just plain weird to listen to