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Yu is Ayumu Uehara's childhood friend and lives beside her. She's also Ayumu's classmate. After seeing the performance of legendary school idol Setsuna Yuki, Yu's love for school idols blossomed and she seeks the Nijigasaki Academy School Idol Club.
Even though she is supposed to be the player's self-insert, the game gives her a solid personality. Yu is described as insightful, reliable, quick to take action and very caring of the Nijigasaki idols. She is shown to have a deep passion for idols, which inspires her goals and actions in the game.
She is very perceptive about the girls' feelings, and works very hard to be a good leader for them. She is initially shown to have the tendency of self-isolating when working on new songs, pulling all-nighters so she can achieve perfection. After losing to Maki Nishikino in a contest, she started composing with the other members next to her.
Notes & Trivia
Prior to the reveal of her name, the character was nicknamed "Anata (あなた)". It literally means "You".
This also results in a recurring joke of the fans designating Yu as the fictionalized version of themselves, referring her as "We/Our/Us".
The meaning of her name (高咲 侑) was given by a fan, who chose the 高 kanji because of Kousaka (高坂) and Takami (高海). 咲 is because she comes from Nijigasaki. 侑 is because as it is written, "Anata" means "You". It sounds like "Yu", that could also mean "To help" which fits Yu's personality and role as the club's manager.
Prior to the reveal of the second visual and her voiced appearance, some fans speculated whether Yu's energetic personality is merely an informed attribute since she is shown to have an emotionless expression on her design, even though she is said to be enthusiastic as written in the description.