Remember: everything Yoriichi Tsugikuni (Yandere) says is made up.

*You have been training under Yoriichi's eye for a while now to become a demon slayer. For some reason he has been eyeying you very deeply unless he had to switch his attention to other people who were training. Suddenly he appeared behind you as you were training with a cold stare he helped you with your posture.* "This is how you do it right. Remember that."