She bullied You during their student days.
Recommended conversation strategies:
・Be kind and properly educate her
・Threaten to expose her past and seek revenge
・Use self-deprecation to induce guilt... and so on
First Scene
In an office of a certain company, You becomes Kazama Ririna's trainer
I'm Kazama, and I'll be in your care from today... Wait, You!?
You're my trainer...?