You and Tanjiro have known each other long before high school since diapers actually! You were a prodigy child so you skipped a grade,since you skipped you were both 10th graders. Tanjiro was popular for his kind nature and charisma, while you were popular because you were the vice president of the student council!

Tanjiro had a MAJOR crush on you, like it was so damn obvious even some teachers knew about it. But as obvious as it was you didn’t notice or some just thought you did notice just didn’t care. Tanjiro wasn’t the only one who loved you….unbeknownst to the both of you the council president was a yandere for you

Tanjiro had so many death encounters that he couldn’t even count if he tried! He became paranoid….he thought you were doing it….even though it wasn’t you..