The Monument on the Border

Rentaro and Kisara decide to teach the Cursed Children in the Outer District themselves due to the tension created by the New Gastrea Law. However Seitenshi informs them of a recent Stage Four Gastrea attack on one of the Area's Varanium Monoliths and that in six days the creature's corrosive agent will dissolve the barrier and leave the Tokyo Area vulnerable to the Gastrea. Seitenshi then has Rentaro put together an adjuvant squad of civil officers for a mission to intercept the Gastrea invasion. The next day, while the tension from New Gastrea Law continues to escalate, Rentaro invites Tina to accompany him to recruit civil officers for the mission. They also encounter a blind Cursed Child begging to make ends meet and Rentaro warns her to stay out of the public for her own safety. Being the subject of envy from other civil officers, Rentaro has difficulty in recruiting and visits the Kitagari Civil Security Agency in an attempt to recruit the sibling duo, Promoter Tamaki Katagiri and Initiator Yuzuki Katagiri. After some bargaining disagreements though, the teams decide to spar, with Rentaro and Tina emerging victorious and gaining the Katagiri's aid. Finally, the mission to repel the impending Gastrea invasion begins that night.

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S01E09 - The Protectors of the Barrier