Atomic Heart Hentai
Atomic Heart takes place on the grounds of Facility 3826, the Soviet Union's foremost scientific research hub in an alternate history 1955. In 1936, scientist Dmitry Sechenov developed a liquidized programmable module called the Polymer, sparking massive technological breakthroughs in the fields of energy and robotics in the USSR and freeing much of the populace from manual labor. When World War II broke out, the Soviets quickly gained the upper hand, but just before Nazi Germany was defeated in 1942 they unleashed the Brown Plague virus, leaving millions dead and creating an international demand for Soviet robots to compensate for the resulting worker shortage. As part of the Soviet Union's post-war reconstruction programme, Dr. Sechenov created a wireless, networked artificial intelligence called "Kollektiv 1.0" that linked his robots together for greater efficiency.
Most recently, Sechenov developed the THOUGHT neuroconnector, a device that integrates Polymer into the human body and allows humans to remotely interface with robots. THOUGHT is to be released alongside Kollektiv 2.0, and Sechenov boasts that it will usher in a true post-labor era for the entire world. However, Kollektiv 2.0's official launch on 13 June 1955 goes awry, plunging Facility 3826 into chaos.
Agent P-3 is a WWII veteran with memory problems. He is invited to assist in the rollout of Kollektiv 2.0 at Facility 3826, but he finds that robots massacred most human personnel. Sechenov explains that Petrov sabotaged the Kollektiv 1.0 node and asks P-3 to apprehend Petrov. With his AI partner CHAR-les (nicknamed "Charles") attached to his glove, P-3 must confront homicidal robots and failed biomechanical experiments while dealing with growing mental instability.
P-3 tracks down Petrov and finds out that he is working with Filatova. Petrov flees and is apparently killed by a robot. Meanwhile, the Politburo grows suspicious about what is happening. Molotov, a member of the Politburo threatens to shut down Sechenov's "Atomic Heart" project. Charles explains to P-3 that Sechenov and the Politburo are in a struggle over who will control Kollektiv. Sechenov orders P-3 to intercept Molotov, but once P-3 makes contact, he blacks out and wakes up to find Molotov murdered.
As P-3 continues to pursue Petrov, who rants about how Sechenov plans to enslave the world. He tells P-3 that the rogue robots had a combat mode installed beforehand. Viktor then gives P-3 a pair of rings and commits suicide. When Sechenov asks about the rings, P-3 lies, and concludes that Sechenov and the Politburo's "Atomic Heart" project involves distributing combat robots disguised as civilian robots to seize nuclear power plants. P-3 takes Petrov's head to a lab to extract his memories, but Filatova destroys the machine and knocks P-3 out.
When P-3 wakes up, Filatova reveals to him that Kollektiv is a means to mind-control people. Shocked, P-3 works with Filatova to find out the truth from Sechenov. In the lab, P-3 discovers that Charles isn't an AI, but the mind of Chariton Zakharov, Sechenov's friend and a fellow researcher presumably murdered by Sechenov. Using Zakharov's security clearance, they uncover more of P-3's past. P-3 learns that in order to fix his brain injury, Sechenov installed a Polymer implant, erasing memories of his deceased wife Ekaterina, and giving Sechenov the ability to control him. Furious, P-3 decides to confront Sechenov.
However, P-3 blacks out again and wakes up in the care of his mother-in-law. She reveals that P-3 had killed Filatova while blacked out. At this point, P-3 can either choose to leave Facility 3826 or confront Sechenov, resulting in different endings.