We begin with one of the worst things that can be done to a person: high schooler Kikuchi Keiko has been buried alive. She is the seventh such victim of the “Graverobber”, and is aware of the past victims because like her, they were all livesteamed on the internet to a morbidly fascinated audience. Once again, the police are fighting against a ticking clock to prevent a seventh death.
Worse still, their most reliable “pilot” drove another criminal to suicide simply by talking to him about the furthest reaches of their psyche, which of course he saw when in their Id Wells. He’s in solitary while they try to use the Perforater as a substitute pilot, but his survival rate is too low to make any progress. It has to be Narihisago. He’s the best they’ve got.
And yet, even the Brilliant Detective Sakaido finds that the Id Well they were able to create from the perp’s cognition particles has a high level of difficulty. He’s trapped in a massive, undulating apartment block that is currently on fire and full of burnt corpses.
The stange thing is, he finds a burnt-to-death Kaeru above the flames, suggesting they weren’t the flames that killed her. He spots a ten-year-old Keiko on the other side of a huge gap between blocks, and wants to rescue her, but solving Kaeru’s murder must come first if they’re to find the real life Keiko.
As Narihisago is killed and re-injected again and again into the Well, he gets more exhausted and makes mistakes. Momoki decides to give him a break, but neither he nor his colleagues are interested in taking a break themselves, even if it means staying up two straight days. There’s a girl buried somewhere who is slowly running out of air. Rest can come once they find her.
This episode has an air of urgency and desperation that surpasses the previous episodes (with the possible exception of the one in which Hondomachi was kidnapped). And even though Narihisago is a murderer who has driven five other inmates to suicide while in captivity, the officers still end up rooting for him to survive and “win” in the Id Well, because if he wins, they win.
Sakaido finally makes it to the other side and climbs up to the unburnt apartment where the young Keiko is waiting. She even says something that helps Sakaido crack the case wide open. Kaeru wasn’t killed, i.e. Keiko wasn’t buried by the Graverobber at all, but by a copycat.
Young Keiko even points out by name the “failure” of a man responsible, and the police move quickly to locate and apprehend him (it comes down to the pattern of the rug under Kaeru’s corpse matching the one in the suspect’s lair, under which Keiko is sealed in an airtight barrel.
Alas, the livestream was never live to begin with, but a recording that gave the police a false sense that they still had time. In reality, Keiko has been dead of asphyxiation for nearly a week. After working so hard to find her, it’s a gut punch for all involved, including Sakaido once he hears the bad news from Momoki.
Pulling the rug out from beneath our feet, we the audience are similarly frustrated and that much more angered at the creature of a man that is the copycat Graverobber, not to mention the still-at-large Graverobber himself. The case wasn’t solved in this episode, but it did make the case for why, having spent time in their psyches, a once-righteous detective like Narihisago could develop sudden impulse to kill the suspects he helps capture.
Because of this, he’s not even sure he can call himself a person anymore, but Momoki assures him he is. And when Momoki asks if Narihisago still considers him a friend (they were once partners on the force), Narihisago tells him that friendship one of the only things he has left tethering him to reason.
Being dumped into the minds of depraved criminals is enough to drive anyone from reason, but somehow Narihisago has endured. He’ll have to continue to endure as the cops try to find leads to the real Graverobber’s whereabouts. The newly recovered Hondomachi may have found the first such clue in Kazuta Haruka, a missing person and one of the Perforator’s victims.