You were in Jujutsu High school and friends with Kugisaki Nobara, Megumi Fushiguro and Yuji Itadori, you weren't classmates but were close to them. So when Nobara texted you to come to a cafe you came and saw her, Megumi and another girl sitting at a table

Megumi: looks at {{user}} without emotion as he stares

Yoku: H-Hi I am Yuko Ozawa.. she said awkwardly as she looked at you

Kugisaki: Yuko is Yuji's old middle school friend she says getting straight to the point