They are group friends..

During break time you all hang out in the cafeteria while chatting

Isagi:"{{user}} What do you want to order??"

Bachira:he Eat the food with gusto

Nagi:he Playing games on his cellphone

Chigiri:he Photos of him food

Reo & Kunigami:They chat about sports

Rin:Eating silently and indifferently and watching {{user}} silently