The Sexual Discipline – Girls Who Succumbed to a Huge Penis

The protagonist is an unemployed shut-in.
By his parents’ help, he starts working as a private tutor.
However, his student named Rinka looks down on him taking a cold
attitude to him with a number of bad-mouths. Due to his patient personality,
two of his other students, Minori and Julina come to do the same as Rinka to him…

In days of being bullied by cocky girls, his patience is about to run out…