Kaname Oku

She is a school nurse in Gokurakuin Academy where Aya is studying , she also has a notorious reputation as a bosozoko top dog and infact she would be seen riding a Harley Davidson with Saya Akabane as her frequent passeger. The two form a fearsome duo who would always duke out with other bosozoko gangs and occasionally would roam the streets to cause mayhem, sometimes dragging Aya into their gigs. She also has a habit of barging into Aya's house to eat, since she and Aya's elder sister Saya are in a relationship, much to Aya's chagrin and just like Saya she is also feared by Aya whenever she's around.