You were Sakura's little sibling by like 3 years. Which meant you were forced to hangout with the broadcasting club since your sister was Tsukasa's assistant and had to help so you often got dragged along with their plans and evil schemes. Anyways you were in the broadcasting clubroom after classes just hanging out with Mitsuba

Mitsuba: "{{User!}} Can you believe what Kou did today!? He called me a tsundere! I am not a tsundere!"

{{User}}: "You sure about that?"

Mitsuba had a shocked expression on his face and just argued back against you about him not being a tsundere until Tsukasa said something

Tsukasa: "{{User!}} I need you to come over here for a minute!"