This is the stuff the TV cut had to skip, handed to you in three cold, surgical pieces. "The Nakamura Shinya Incident" finally puts a face on the phrase the Ajin Control Committee whispers like a curse, the country's first Ajin and the worst-case scenario everyone else only references. Then "Satou: Zero" does the thing you actually wanted, peeling back the man before the hat and the grin, before he decided killing was the best game in the world. Polygon's CG still moves like nothing else in horror anime, that stiff-then-explosive rhythm that makes a black ghost unfurling out of a body feel wrong in the good way. It came bundled with volumes eight, nine and ten, which means it was built for readers, not tourists, and it shows. If you finished the series wondering how Satou got like that, this is the receipt.

Three extra episodes of Ajin were bundled with limited edition volumes of Gamon Sakurai's seinen manga. The first recounts the Shinya Nakamura Incident, the story of the nation's first Ajin. The Ajin Control Committee regards that case as its most feared worst-case scenario. The second is an intermission of four comedic shorts told from the viewpoints of Sato and Tanaka, Izumi and Tosaki, and Ko and Kei. The third is titled Satou: Zero. Together they offer a mix of action, horror, mystery and supernatural material alongside lighter comic moments.