Agata Katsuhira, a strange young man who doesn't feel pain, encounters a mysterious young woman named Sonozaki Noriko.

The kids are forced into doing self-introductions, but it appears they'll be required to do much more than state their names and class numbers.

The kids find out that there's actually one other Kiznaiver and go searching for this mysterious figure.

The kids get to know Hisomu, and Sonozaki promises to let them know a secret about Kiznaivers if they agree to go to a summer training camp.

The Kiznaivers arrive at their training camp and are faced with a summer favorite, the test of bravery; meanwhile, Chidori runs off on her own, and the others realize that they might be connected by other means than just their pain.

Something from Honoka's past comes back to haunt her, and Nico makes another attempt at becoming her friend.