Shiori Usami/Relationships

Osamu Mikumo
She seem to cares for him and helps him when he need one.

Yūma Kuga
She seems to cares for him.

Chika Amatori
Usami likes pampering Chika, and always helps her during rank battles.

Yōsuke Yoneya
They are cousins. They seem to have a really good relationship, as Yoneya is seen taking care of Yōtarō on Usami's behalf.

Kazama Unit
Usami maintains good relations with her former unit, though she is annoyed by Kikuchihara's blunt nature.