This girl just called him a Chad and this story just got so much better 😂
So in summary we got
Mami- the bitchy popular girl
New girl- the anime otaku girl
Raku- the Uber clingy romantic girl
Rami- the quiet girl (angel)
And Chizuru- the secret theatre girl
@lets just replace Ruka and Mami with her, get it over with. It's clear the 16 year old highschool girl that's blackmailing him is just being used as a plot device to further Chizuru and Kazuya's relationship.
My prediction is that Ruka will at some point push it too far forcing Chizuru to accept her feelings and take him back