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Derek was an adventurer from Zetsuya and part of Mils Ace's criminal group.
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He appears threatening and manipulating Rinon to suit himself under the threat of having her sister captive, asking her to steal Makoto from him after she told him about his unusual resources.
When Tomoe and Mio infiltrate their base to rescue Toa, Derek falls under an illusion that Tomoe puts on him as a payment for the favor Rinon did for her.