Kasane and company wake up to a shocking reality and strange encounters. Kasane learns about the emptiness in the sky and a way to stop it. Yuito and Kasane confront each other after she discovers the real reason for Karen's rebellion. Kasane goes to Seiran with other FSC members.

The hunt for Nagi continues. Yuito's platoon is ambushed but makes a narrow escape. Fubuki and Luka reveal the hospital's secrets and the dark truths behind them. Kasane's platoon searches for Naomi. Karen offers to help with Naomi's condition.