Friends become enemies as the OSF splits in two. Yuito receives a promotion, but why can't he remember? Karen creates a new Seiran OSF platoon and tells Kasane they have Naomi in their care. The hunt for Nagi is on as Yuito gains fresh intel.

Fubuki reveals his mindset to Yuito. After approaching Kaito, Fubuki's plan takes shape. Yuito's ailment worsens, and he tries the drug he was prescribed. His platoon discovers a secret manufacturing plant and has a run-in with Kasane's platoon.