A-set

A-set, real name Iris Sagan (左岸 イリス, Sagan Irisu), is a female Japanese and English-language Virtual YouTuber who was created by Kozaki Yūsuke and Uchikoshi Kotaro for the Japanese video game developer Spike Chunsoft. She is one of the main characters of the Spike Chunsoft game AI: The Somnium Files. In-universe, she belongs to the idol agency Lemniscate. Her presence on YouTube and social media began as part of a Viral Marketing Campaign to promote AI: The Somnium Files. She also occasionally makes tweets and videos about other Spike Chunsoft games, and comments on gaming news in general. On July 2019, she went into semi-retirement. With two bonus videos being uploaded post-release. Both the Western and Japanese accounts still actively tweet, though the latter has stopped making original tweets entirely as of September 19th 2020, and only retweets fan art of the game alongside promotional tweets from the main Spike Chunsoft account.