: The episode ends as numerous gates open simultaneously across Mikado City, signaling the start of the massive invasion. Key Characters & Themes

: Yuichi Jin senses grave danger for Osamu Mikumo and asks Shuji Miwa to keep a close watch on him during the coming battle.

Episode 21, titled " The Neighbors' World " (released February 2020), is a pivotal transition point that shifts the series from character introductions into the high-stakes Large-Scale Invasion Arc . Episode Overview: "The Neighbors' World"

: Officially meets Natsume Izuho , a fellow sniper-in-training, marking the start of a supportive friendship.