Erika and Nagi walk around the festival together, and she shocks him with how out-of-touch she is.
When did you even introduce 
Sachi-chan to her?
متى عرّفت ساتشي-تشان عليها أصلا؟
Quand est-ce que
tu lui as présentée ?
Quand'è che le hai presentato Sachi?
E quando foi que você
apresentou a Sachi-chan a ela?
И когда ты успел представить ей Сати?