"This QUELL's song. Our song."

Izumi Shu, who once worked as part of a national idol unit, has been  busy lately promoting the drama he's starring in. Meanwhile, in order to catch up to their leader, Horimiya Eichi, Kuga Issei, and Kuga Ichiru, the other members of QUELL, devote themselves to their work and lessons.
We've known each other a long time.
نعرف بعضنا منذ زمنٍ بعيد
Nos conocemos desde hace mucho.
Nos conocemos desde hace mucho.
Ça fait un bail que je te connais.
Ci conosciamo da tanto tempo.
Nós nos conhecemos há muito tempo.
Мы давно друг друга знаем.