Rei Nasu/Relationships

Yūko Kumagai
Nasu and Kumagai share a strong friendship and care deeply for one another, so much so that Nasu was outraged by Wen Sō disguised herself as Kumagai and, right before defeating the Neighbor, she claimed that she was taking revenge for the injuries she had inflicted on her friend. In combat Kumagai often serves as Nasu's bodyguard. Nasu calls Kumagai by her nickname followed by the diminutive suffix -chan, while the latter calls her by her first name, without honorifics.

Akane Hiura
Nasu cares about her teammate and found more motivation to rank higher when she heard about Akane moving. Nasu addresses her by her first name followed by the suffix -chan whereas Hiura uses her surname and the honorific -senpai, reflecting their closeness as well as Hiura's respect for her captain.

Sayoko Shiki
As with her other teammates, Nasu appears to be friends with Shiki, whom she calls by a nickname followed by the suffix -chan; the Operator, on the other hand, addresses Nasu by her surname followed by the honorific -senpai as a sign of respect.

Tōru Narasaka
Nasu is Narasaka's older cousin by three months, and she is the one who asked him to mentor Hiura.