The unnamed protagonist lives with his stepsister, Isuzu, who is a massively popular VTuber known as Isuzu Wine with over one million subscribers. One day, Isuzu forgets to turn off her livestream, and a candid, unfiltered conversation between the siblings is broadcast to her entire audience. Clips of the accident spread rapidly across the internet, and overnight the protagonist finds himself transformed into an online sensation against his will. The more accidental exposure he receives through his sister's streams, the more his popularity grows. As the story unfolds, he is drawn into the streaming world alongside his overly affectionate and strikingly beautiful stepsister, as well as a kind senior VTuber. Together, the trio navigates the chaotic entertainment industry, balancing romantic comedy elements with the protagonist's reluctant rise to fame.