A-set

A-set, real name Iris Sagan (左岸 イリス, Sagan Irisu), is a female Japanese and English 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 an ARG (alternate reality game) 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.

In July 2019, she went into semi-retirement at the conclusion of the ARG. She still occasionally tweets and posts videos, often to promote other Spike Chunsoft games.

Personality
A-set is a cheerful and optimistic girl who approaches life with enthusiasm. She began dancing at an early age, and later in her childhood picked up interests in gaming, movies, Egyptian mythology, and the occult. She maintains an interest in urban legends and unsolved mysteries, occasionally discussing these topics on YouTube and social media.

She has a stong relationship with her mother Hitomi, who she considers the most important person in her life. Her best friends are Okiura Mizuki (沖浦 みずき) and Matsushita Ota (真津下 応太). Ota considers himself one of her biggest fans and interacts with her via his own Twitter account.

Trivia

 * She is a fan of varous real-world media properties, including JoJo's Bizarre Adventure, Danganronpa, Pokémon, Super Smash Bros., and Steins;Gate. She also frequently expresses her love for the fictional game ShovelForge.
 * Her single, Invincible Rainbow Arrow, debuted with her in her first YouTube video. The full version was later made available on the album "AI: THE SOMNIUM FILES Complete Soundtrack -RaiNBOW AFFaiR-".