Pedophile-sensei needs to leave these girls alone and quit being a teacher.
Other a more positive note, I'm glad that Kanzaki is turning out to be a good dude. Hopefully he can become a bit more open-minded and support MC through her academics.
I wonder what the incident was that caused him to quit studying law.
Maybe it had to do with another illegitimate child, like a court case he was working on. Or he knew someone whose child was taken away just because having a child young and out of wedlock tarnished someone's reputation. Maybe the incident had something to do with Momoko's adopted mom dying.
EDIT: Look at chapter 7, page 20. It looks like he's looking at Momoko's mom. If so, that means they went to the same high school.
@Umesan
She said "he sounds like mom," meaning he feels like children should be protected by society instead of ignored / hidden for reputation's sake
@Drimson No, that's incorrect. Momoko's biological parents were in debt and they ran away leaving her. So this grave is for her adoptive mother, the one showed up in chapter 4.5