Shuuya Kano/Relationships

Kido
Kano tends to tease Kido a lot and gets hit or kicked by her for it most of the time, since she doesn't show any tolerance for it. Even though he gets called an "idiot" or "bastard" by her a lot, they seem to be very close childhood friends, seeing as they grew up in the orphanage together. Kano describes her past self as "cute".

Seto
Seto grew up with Kano and Kido in the same orphanage, therefore they're childhood friends.

Mary
Kano is always teasing Mary whenever he gets a chance too. In the manga, Kano teases Mary with a job offer only to get frozen by her for a short period of time.

Takane
Kano went to Takane's culture festival with Kido. They met Takane at her booth and decide to play the game she offered.

Ayano

Ayano was told by her mother to be a "big sister" for Kido, Kano, and Seto. She was the one taking care of them in the orphanage. Ayano followed her wish and started to become friends with the three of them, what turned out to be difficult, as they thought of themselves as "monsters", due to their eye abilities. Eventually, Ayano came up with the plan to create a secret club of heroes and gave them their hoodies as a present