[Oshi No Ko] Spica of the First Star

Sometime after joining B-Komachi, Ai Hoshino tells Ichigo Saitou, the president of her talent agency, that she has decided to quit the idol business. Though her group appears to be thriving on the surface, there is serious discord among its members. That’s when Ichigo offers her a different proposition... A companion to the hit manga, this volume also includes the story of how Gorou and Sarina meet and part ways before becoming Aqua and Ruby, and a special bonus episode entitled "POV B"!

[From Yen Press]