Beneath the Old Building

Beneath the old school building lies an abandoned laboratory where dangerous experiments were once conducted. When two students find it, they realize the school's quiet history is actually built on lies.

Experiments Best Forgotten

The old building at Kitagawa High has been scheduled for demolition for years, always delayed by mysterious 'structural concerns.' When biology club members Kei and Natsumi sneak in to retrieve a forgotten club project, a collapsed floor drops them into a sprawling underground laboratory that predates the school itself. The lab was built in the 1970s by a government-funded project researching human enhancement through symbiotic organisms. The experiments were shut down after a catastrophic containment breach, but the organisms — called 'Puppeteers' — survived. They can bond with human nervous systems, granting enhanced abilities but slowly consuming the host's free will. The lab's lockdown protocol was never truly deactivated; the Puppeteers have been breeding in the dark for fifty years.

A History Built on Lies

Natsumi is infected during their first exploration when a Puppeteer attaches to her spine. Initially, the symbiosis seems beneficial: she gains perfect recall, increased stamina, and the ability to sense danger. But Kei notices her personality changing — she's more aggressive, less empathetic, and occasionally speaks in a voice that isn't hers. The Puppeteer colony's queen, a massive organism in the deepest chamber, begins communicating telepathically through Natsumi, offering Kei a deal: help release the colony into the school above, and Natsumi will be freed. But Kei finds evidence that no host has ever been successfully separated, and that the original researchers are still alive — now elderly patients in a classified hospital, still partially controlled by their Puppeteers five decades later.

Unearth the Truth

Body horror meets conspiracy thriller in this gripping series. The Puppeteer concept is viscerally unsettling — the idea of losing yourself while gaining power is explored with nuance and genuine terror. Kei and Natsumi's relationship is the emotional anchor: lifelong friends whose bond is tested when one of them isn't the same person anymore. The art excels at biological horror, with the Puppeteers rendered in disturbingly beautiful detail. The conspiracy angle — that the government buried this lab and built a school on top of it as a surveillance measure — adds a layer of political paranoia that elevates this beyond standard monster fare.

Key Details

  • Category: School Supernatural
  • Rating: 4.3/5
  • Status: Ongoing
  • Chapters: 52
  • Tags: Laboratory, Body Horror, Conspiracy, Supernatural, Thriller

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