Makoto Hitsujiya transfers to a new high school where he meets the mysterious and unpredictable Takehiro Kokudou. Before long, Kokudou introduces him to the world of “Bugs” — strange phenomena triggered by performing very specific sequences of actions. These bizarre anomalies can create impossible results that defy logic, science, and even human limitations.

Some Bugs are harmless and absurd, while others grant abilities that seem completely supernatural. As Hitsujiya and Kokudou experiment with these hidden rules, their friendship deepens and their obsession with discovering new Bugs grows stronger. What begins as curiosity soon turns into addiction as they push further into a dangerous world filled with unpredictable consequences.

However, everything changes when Hitsujiya uncovers the conditions for an incredibly powerful Bug capable of altering his future itself. Faced with temptation and uncertainty, he must decide how far he is willing to go in pursuit of the impossible.

Bug Ego is a psychological mystery manga filled with suspense, strange supernatural phenomena, dark experimentation, and mind-bending twists that keep readers constantly questioning reality.