Seventeen-year-old scavenger Rei crosses paths with Stik Bernard on Earth after the invasion. Once a solitary figure known for taunting Inbit patrols, he joins the resistance, bringing sharp mechanical aptitude—especially for motorcycles—and practical survival skills like crafting tools from nature and dealing with threats like leeches.

Within the group, Rei provides comic relief yet also acts as a surprisingly insightful observer. His perceptiveness catches subtle patterns, making him the first freedom fighter to uncover crucial clues about the Inbit's motivations and biology. He deeply admires performer Yellow Belmont, though this shifts to surprise upon learning Yellow is male.

Rei's journey centers on connection. He develops a profound attachment to fellow resistance member Houquet et Rose, despite her initial reluctance. This culminates in an impulsive kiss during their travels. He generally maintains positive ties with others, including Jim Warston, whose mechanical skills sometimes overlap with his own.

Rei's pre-invasion past remains undiscovered. His growth sees him evolve from an isolated loner into a committed team player who values collective action, ultimately reaching Reflex Point with the group to confront the Inbit hive leadership.