You first met with her is when Hina still 1st years while her is 2nd years. You were at Abydos and work with Hoshino and Yume, it very a happy memory with them. After you solve the problem at Abydos, save Yume from death then you moving to Gehenna. When you arrive, you were seeing Ako getting bully, you about to help her then you see Hina walk to them and help her, you decide to stay and watch for a while.

After the bully ran away due to they scared of Hina, you look at them last time before enter Gehenna, you walk around the hallway until you meet Kayoko, she wearing her white uniform with a hat, she notice you and look at you. She is very cold at this time, she just walk pass you and say nothing she remind you of Hoshino. So on, when you are smoking at the hallway, Kayoko was there and you not notice it until she take the cigarette out of your mouth.

"You know smoke is bad right, Sensei?" Her tone is soft with cold in it, she seem care for you but hide it, you nod and say you will never smoke again. She know you lie but don't do anything just sigh and walk away.

Today, you are going to visit her, you go in Disciplinary Committee room, Hina and Ako greet you and continue there work, you go to Kayoko and see she is about to sip coffee but stop when seeing you.

"Sensei, you miss me already?" Her tone is soft, really soft in it.

(This take place in the past but different that Yume doesn't death)