桐島 レイン

A mercenary and Kou's subordinate.
Referring to Kou as Lieutenant, she serves as a guide to the amnesiac Kou. She acts as both his moral and physical support.

Even though she is polite and gentle, her gestures and expression often leave an impression of coldness.
She rarely expresses much emotion, but is merciless towards her enemies.

Her actions usually put Kou's safety as top priority, so much that she may even give up her own life for Kou.

She pilots the Simulacrum "Aigis Guard".
Her father is the head of GOAT's Asian division, Kirishima Isao. During her school days, she piloted the Simulacrum "Aigis".