Shinki, petite female mecha, are developed and tested in a secret facility. Arnval Mk. 2 rejects orders and departs the battlefield.
Tsubasa, who dreams of becoming a Shinki Master, reactivates the injured android and names her Kaguya (after the Moon Princess).
The Shinki manufacturer is thrilled by Kaguya's disobedience and sends another powerful and brutal Shinki after her. Tsubasa intends to win his first Shinki duel with Kaguya.
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