Holy fucking dumpsterfire, I feel betrayed by Kojou xd
And her little sister is fucking gross girl.. cut her out of your life honestly.. she just gonna ignore her nude modelling for her obsessive father who clearly sees her sexual and making out with her classmate ?..
Honestly.. get your sister a therapist and leave home 😐
Author clearly didn't know how to write functional characters with actual reactions ..
Usually every action has a reaction, but here you have just actions, yet no reactions <_<