Ep. 5: Nishinosono and Saikawa investigate Shindou's murder and Shiki's past
Aired on November 6, 2015

Nishinosono and Saikawa investigate Director Shindou's murder, uncovering details about Shiki's multiple personalities and her parents' death 15 years ago. They attempt to understand Shiki's thoughts to find clues, which forces Nishinosono to confront her own past.
Episodes
- Ep. 1 · Professor Saikawa and student visit imprisoned doctor on isolated island
- Ep. 2 · Moe's sinister discovery at Dr. Magata's lab during the Himeka island camping trip
- Ep. 3 · Shiki's sealed room reveals a mysterious corpse that baffles everyone present.
- Ep. 4 · Shindou's Death and the Discovery of Robot Michiru in Shiki's Room
- Ep. 5 · Nishinosono and Saikawa investigate Shindou's murder and Shiki's past
- Ep. 6 · Saikawa and Nishinosono return to the camp and investigate Dr. Shiki's rooms for a clue.
- Ep. 7 · Saikawa encounters Miki and notes Dr. Magata's unchanged childhood mind while Moe faces her past in VR with Shimada.
- Ep. 8 · Nishinosono recalls Saikawa's presence after her parents' death following VR experience
- Ep. 9 · Saikawa solves the locked room mystery after police investigation stalls on the island.