Miko Kurono, a recent junior high school graduate, launches her livestreaming career under the alias "Necronomico." Driven by the goal of viral fame and heightened popularity, she streams diverse content, though persistently low earnings fuel periods of discouragement. She shares a home with her childhood friend, Mayu Mayusaka. Mayu's subsequent hospitalization compounds Miko's emotional strain.

During this difficult time, Miko receives a significant opportunity: an offer to test-play a brand-new virtual reality video game. Accepting this offer, she enters the game's unique virtual environment alongside Mayu Mayusaka and her rival, Kanna Kagurazaka. Together, they confront the game's mysterious challenges. This VR experience marks a pivotal shift in Miko's circumstances.

Her journey begins with the first episode, test-playing the "Eldritch God Game Demo [Cthulhu]," initiating her deeper involvement in the game world and its trials.