S4

S4 is an idol unit comprised of the top four students at Four Star Academy, who are also at the top of the idol world. The unit is currently at its 27th generation, consisting of Nijino Yume, Kasumi Mahiru, Saotome Ako and Haruka☆Ruka.

System
An S4 Selection is held at Four Star Academy every year, where selected students from each class compete with the current S4 member of each class. The new winner will be immediately appointed as the new S4 member. However, if one is going against a senior and have lost, they will be appointed only after the current member's graduation.

Members

 * -|27th Gen=
 * Nijino Yume
 * Kasumi Mahiru
 * Saotome Ako
 * Haruka☆Ruka