Harashima Ruka

 (原島ルカ) or better known as RUKA is a former Japanese idol and a former member of SAKURA MODE~Sakura Uchuu, Otan43, and Watarasebashi43.

She joined 43project as a member of 43X in 2016 and was promoted to a full member in February 2017.

She graduated from the group on December 21, 2019.undefined

Profile

 * Hobbies: Watching dramas
 * Special Skill: Crafting, pictures, swimming, and bridges
 * Favorite food: Mango
 * Favorite word: Daisuki! (大好き！; I love you!)
 * Favorite artists: ANGERME; especially Sasaki Rikako

Singles

 * MY MODE / Wake Up!

Trivia

 * Her older sister is Harashima Miu.
 * She graduated from SAKURA MODE~Sakura Uchuu alongside her sister.