I really think that Yayoi as a character would make way more sense as a teenager around 13-15 years of age. For her to still be in the single-digits seems a bit off as kids around her age are nowhere near as intelligent as her, but then again, she's supposed to be a genius child prodigy. Also...
I think a more fitting title for this chapter is "penitance" as Nene is showing remorse for her actions, but I can see why "baptism" was chosen. The squeezing of the razor was synonymous to a baptism and she has now been rebirthed.
Educators have my highest respect. I was a problem child and it was one teacher that showed me that I could be so much more. I hope you can be the same for even one of your students.
Bro... The concept for this manga was so cool in the first few chapters but now its ridiculous. How the hell does the telescope guy end up being the final boss lol. The author was probably smoking some crazy stuff.