Ep. 4: Imaginary Gear

As soon as Naoto hears that RyuZU's sister is slumbering in the basement, he agrees to help. After numerous trials, they finally make it to the lower floors of the Core Tower and continue their work, but the countdown for the purge keeps ticking. Under pressure, Naoto is forced to make a decision that could end up in him losing RyuZU. (Source: Crunchyroll)

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