[@Stern Algorithm]

"Cripes!" Kyouran called out as Akane suddenly threw his glass on the ground. "I don't know who this 'Suna-kun' is, but if you need to beat someone up, you can rely on 'Big Sis'," Kyouran said, referring to herself.

^She does realize who she is inviting to call her Big Sis? Akane can be kind of Yandere about his relationships. This is going to get really out of hand now. I just felt a big bubble of excitement when he heard the word Big Sis now it's all he's going to call her and now he's going to ask her for instructions