Sayoko Shiki/Relationships

Rei Nasu
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.

Yūko Kumagai
Kumagai is the one who scouted Shiki and brought her on as the squad's Operator. The two seem to be the most active while brainstorming the unit's strategies. They appear to be close, as Kumagai addresses Shiki by her first name, without honorifics.

Akane Hiura
Shiki and Hiura are friends as well as teammates. Shiki has a habit of teasing Hiura about her tearful outbursts and addresses her by her first name, with no honorifics.