Hana, a professional video game player and tester, lives in a dark apartment due to her agoraphobia. When glitched monsters appear in her game, she contacts the creator, who invites her to a tournament. Hana declines, knowing she can't win. After receiving a mysterious device called Omnia, connected to her brain, Hana calibrates it with her friend Jen's help. With the device, Hana types and plays games using only her thoughts. While calibrating, strange visions and bleeding gums unsettle her. A little girl visits, sparking memories of her lonely childhood. Hana, deeply nostalgic, looks at old photos with Jen. Using the device, they play games and dance, but Jen leaves when the exercise demands pain. Hana finishes the calibration herself. When playing games with just her mind, she wins effortlessly. However, strange occurrences, like disappearing objects, make her uneasy. During a sudden knock on the door, the landlord demands rent money, causing Hana to realize she's lost track of time. Resuming her routine, Hana continues testing the device, as it learns more about her. Yet, mysterious events and a disappearing ball leave Hana unnerved as she decides to enter the tournament with a newfound determination.