Under Doctor Chapter 36 Spoilers & Manga Raw

To save the comatose Seika, Haishima ventures into the forbidden realm of 'Deep-Layer Surgery.' This chapter reveals that the nanite swarm 'Echo Zero' parasitizing Seika's brain is actually a clandestine weaponization program developed by the lab that exiled Haishima. Through his precise, god-like surgical skill, Haishima successfully extracts a fragment of the swarm, but the success triggers a violent defense mechanism within Seika's body, forcing a monstrous mutation. As organic appendages tear through the hospital walls, Haishima is forced to abandon his role as a surgeon and activate the combat enhancements in his left arm. Just as he prepares to fight, Seika’s eyes open, and she utters the chilling command: 'Doctor, destroy me.' With her consciousness fully compromised by the nanites, Seika lunges at Haishima, driving a razor-sharp claw toward his throat. Next week, the lines between medical duty and lethal necessity blur in a heart-stopping confrontation.