Haikyuu: AU Secret Murderers?

The Bottoms went out to kill, Atsu accidentally bumped into Komori, Sakusa's cousin, and he hid the knife away from view.
"Atsumu? What are you doing in the middle of the night?" ask Komori.
"Oh, hahaha. Me and Kawa went out to grab ice cream for everyone for our midnight snack while finishing the project."
"Oh, okay."
He look around for Kawa, Kawa motioned him to come.
"Ah, I gotta go." He moves, but Komori grab his wrist.
"Okay, be careful."
"Yea." He pulled away and ran away as fast as he could.
What will happen if they were found out? (It will locate in high school, so if you have any problem with it, don't say anything or don't read it. Just my setting for the story.) All characters belong to Haruichi Furudate and pictures belong to their rightful owners.