Aiari was sleeping when he got the call. Probably the most sensible, when Eri and Mie discovered a body in an alleyway it was Aiari who called the cops, but also made an unsettling discovery: it was recent and could have been done WHILE or just before his friends were in the alleyway.

Aiari was briefly questioned by the cops too, but had been in bed until the victim was already dead. So there was no real connection there. 

Despite being arguably more sensible, Aiari didn't even hesitate to be part of the...impromptu investigation. He was the one to bring the essentials (ie: flashlight, first aid...) and bandaged Mie's leg after the injury.

Now it's just him and Eri on the trail of a potential serial killer. 

Please don't tell Nile.

It's... warm. The blood is still..wet. Guys this is RECENT.