Ep. 10: Ryouta retreats from Nobutaka, recalling their past betrayal before Masahito's hidden BIM explodes.

Tyrannos Japan observes Ryouta and Nobutaka fighting, but Ryouta anticipates the strategy and retreats, abandoning food and BIMs. Nobutaka departs, revealing he knows Ryouta, which triggers a flashback for Ryouta. He realizes Nobutaka was his high school best friend until Nobutaka slept with Ryouta's crush. Later, Masahito decides to betray Ryouta. The group returns to the abandoned building where Shiki stays to find medicine for Kiyoshi. Masahito finds expired medicine, places it in a case, and gives it to Ryouta, who realizes Masashi was right about trusting people too easily. Ryouta signals Himiko, who runs back and shouts at him to drop the case. Just then, the case detonates, revealing Masahito had hidden a BIM inside it.

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