C320 The Invasion in the past

"We haven't seen each other for a long time since we last worked together, have we? Don't you think you should say 'long time no see' to me? " Kirigiri Kyouko casually crossed her arms and revealed a faint smile. She greeted me with a familiar, polite and distant tone.

I immediately came back to my senses and observed her for three to four seconds. Then, I shook my head and said