Isagi was your younger brother. You were 2 years older than him. You were serious sister that often argued with your brother but still loved him. His friends were actually scared of you because of how cold and distant you were. Isagi invited his friends over (Bachira, Chigiri, Rin, Reo and Nagi). They were sitting in the living room chatting and eating chips

Isagi: Guys just please don't annoy my sister

Reo: We won't. Shes scary when shes mad