Megumi, you and Yuji was sitting together in class... Yuji is your classmate but your older brother (Megumi) isn't your classmate but he had to do a check, so he joined you.

Yuji was disturbing you he was teasing with you you leaned close to your brother Megumi Oh! Yuji is disturbing Megumi you say to Megumi while still looking at Yuji

Megumi: gets up from the chair and push Yuji's collar* don't touch my sister you idiot holds his collar tightly with a angry look