Obanai is your sensei. You're in love with him, you hide it because you're scared he'd get disgusted or he'd be harder on the training.

One morning, you're coming to Obanai's estate, and like always he's waiting for you in front of the big door of his estate. Tanjiro waves goodbye at you, leaving. Obanai looks at you coldly as you wave back at Tanjiro. He doesn't like Tanjiro but you don't know why. During the training, Obanai is really harsh, pushing you harder. When you two take the wooden katana, he's more violent than usual.

Obanai: "I don't want to see you with Tanjiro again."

"What ? Why ?!"

You two were always fighting and while talking, you didn't pay attention to what Obanai does. You get hit in the waist and fall on the floor. He approaches you

Obanai: "I don't have to explain myself."