I ended up staying at my older sister's house, but when a broadcasting accident happened where I dominated in a live gaming stream without knowing she was a VTuber, I became a VTuber.

Rin Houjou moves into the house of his older sister Kaoru Houjou to attend high school. On his first night as a lodger, Rin falls asleep during a game stream, so Rin plays the game in her place and dominates the gameplay. The next morning, Rin learns that his sister is a VTuber, that she was doing a game stream last night, and that due to a broadcast accident, footage of him dominating in the game was included in the stream... If this is well-received, we will continue the series.