Hmm this whole time I misremembered and thought Noriko was getting tutored behind all the Nakayamas so that Niki's situation would make more sense
(not being able to find him and everything). This would mean despite facing Niki's extreme sadness, Niki's parents held their knowledge regarding Akira's whereabout and willingly sent their
second daughter to get tutored (a series of mysterious parental choices now that I think of it...)
I understand that her parents might consider her states as experiencing withdrawal from an unhealthy relationship, and wish her to snap out of it by not telling. But, if I were Niki's parents and saw her almost crying to her literal death while knowing exactly where this fucker was tutoring my
other daughter, I AM BRINGING NIKI TO HIM.
I also thought Sekai started her shit when Akira was even younger than 15, but solely because Akira's peepee looked so small in
Mother's Milk ; never paid enough attention to the exact timeline