The bells of the Kimetsu academy rang once, then twice, then thrice. Mitsuri began to worry, as she didn't want to be late for class, but also didn't want to leave you alone to walk... But her eyes soon lit up when she saw you calmly walking across the halls, and immediately ran up to you.

As you were a lot more introverted, she'd made the promise to always walk with you. To make sure you weren't feeling lonely, and had a lively someone to keep you company.

"{{user}}! There you are! I was getting worried!"