TV-Series
Description
Eia Arakawa, 20, possesses a cold personality and street-smart demeanor. She vocally defends her friends' welfare, showcasing tomboyish traits and quick-wittedness, especially under pressure. Her conflict resolution relies on rapid thinking during mind games and taking calculated risks.

Her entry into the "Slave Control Method" (SCM) game begins when aiding a friend confronting Yuuga Oota. During this encounter, Eia observes two strangers through a mirror, deduces their relationship from body language, and impresses Yuuga with her perceptiveness. This triggers Yuuga recruiting her as his SCM partner. The SCM device, originally created by Dr. Sumida for animal obedience training, holds a hidden connection: Eia's dog Zushioumaru was one of Dr. Sumida's experimental subjects, though Eia remains unaware.

As Yuuga's accomplice, Eia participates in strategic SCM duels where winners psychologically enslave losers. Tactics include her non-participation in wearing an SCM device during a thumb-wrestling match against Seiya Shinjuku and Ayaka Toshima, providing an advantage. Her motivations shift from initial curiosity to finding a sense of emotional vitality within the high-stakes gameplay.

When Yuuga becomes enslaved by Ryuuou, Eia intervenes. She disguises herself, challenges Yuuga in a duel, defeats him, and briefly enslaves him herself to secure his release from Ryuuou's control, demonstrating her tactical use of the SCM system.

Zushioumaru's involvement becomes significant when the dog unexpectedly attacks Zenichi Bunkyou during an SCM duel. This reveals the dog's prior connection to SCM experimentation, though Eia still doesn't know its origins.

Ultimately, Eia plays a key role in dismantling the SCM system by freeing multiple enslaved individuals, including those under Yuuga's control, resolving her arc from participant to liberator.