Yu becomes interested in school idols after watching a performance of Setsuna...
Love Live! Nijigasaki High School Idol Club
Season 1 Episode 7: Haruka, Kanata, and Beyond
Kanata's little sister, Haruka, is a school idol at Shinonome Academy and comes to visit Kanata at her club one day. The sisters are very close, but Haruka is worried that Kanata is pushing herself too hard and makes a drastic decision.