Opus 8: Silvery Box.Nai, Gareki, Yogi and Tsukumo travel to Rinoll, also known as the "City of Ice". Azana delivers a warm snowman named Yukkin, designed in the Research Tower. Back on Airship Two, Hirato, Akari and Tsukitachi discuss Nai being an experimental specimen for luring Varugas that are trying to capture him. After Nai, Gareki, Yogi and Tsukumo search through a vacation house, Yukkin becomes trapped in a hole, only to be found by Kagiri and Kiharu, responsible for covering their own tracks in the vacation house. Nai, Gareki and Yogi jump into the hole, revealed to be a man-made tunnel leading to the mansion, where they find a small box shaking on its own. Yukkin returns to Tsukumo, but Kagiri and Kiharu suddenly sneak up on her in confrontation, while Nai, Gareki and Yogi come back to the surface after Gareki creates a makeshift grenade from below. Nai and Tsukumo run away, while Gareki and Yogi continue to fight. However, Gareki and Yogi are blinded by Kagiri's gadget. After Kagiri and Kiharu beat up Yogi, his allergy patch is removed from his left cheek, causing several thorns to surround him and his hair to turn silver.