Ren Tsukimi/Plot

Background
Tsukimi was childhood friends with Tachikawa, and mentored him in tactics. She joined Border during its debut.

Introduction Arc
Tsukimi is first heard when Miwa Squad investigates the site of Yūma's battle with the Bamster. Miwa asks which squad defeated it, while Yoneya is impressed with the result of the battle, and Tsukimi says they were the first squad to get there.

Large-Scale Invasion Arc
Tsukimi is first seen when the Izumi and the Snipers team up to battle Hyrein. After Narasaka manages to shoot Hyrein, Iizumi shoots him with Asteroid to distract him. Tsukimi then says Izumi is going to lower Hyrein's guard, and tells the Sniper team to prepare to attack Hyrein. After Kodera asks Tōma to stop playing around and Tōma tells Kodera to shut up, she tells Tōma she doesn't care as long as he hits the target.