Saibou Shinkyoku- Cell of Empireo.- A certain "0.5

Ato Haruki is an investigator working for the Otowa Detective Agency. The story opens with him waking up alone in his office, noting that his colleague Shinano has stepped out to run an errand at a nearby convenience store. While waiting for Shinano to return, Ato attempts to focus on his pending workload. His upcoming assignment involves a mysterious disappearance case tied to a newly emerged religious organization known as the Shikoten Research Institute. However, what begins as an ordinary workday quickly takes a sinister turn. As time passes and Shinano fails to come back, Ato grows increasingly anxious about his colleague's prolonged absence. Soon after, inexplicable and unsettling phenomena begin to manifest within the confines of the office itself, shattering any sense of normalcy. What follows is a gripping bio-suppression action narrative that thrusts Ato into a dangerous struggle against bizarre biological threats. Driven by the urgent need to find his missing partner and survive the escalating horrors around him, he must navigate a harrowing conflict that ultimately culminates in uncovering a profound and hidden truth.