I love how we can see some glimpses of Nemo's inner personality and how she seems to be nearly as weird as Tomoko (not as a pervert, but by having her "dark thoughts") but she can keep it hidden well and communicate with people, plus she also seems to have similar "good sides" to Tomoko as well - she's pretty much Tomoko with good social intelligence
This chapter was really nostalgic to me, I still remember the joy of ending up in the same class as most my friends and the sadness of not being in the same class as my BEST FRIEND specifically - so I used to escape from my class and hide in my best friend's class mid-lecture just to hang out with him, some chill teachers didn't care and others would complain a lot XD