Oshi No Ko Vol 3

Oshi no Ko by Aka Akasaka. A Drama manga rated Older Teen, published in English by Yen Press.

A small-town doctor and devoted fan of teen idol Ai Hoshino is killed, and reborn as one of her secret twin children. Growing up behind the scenes of the entertainment industry, he discovers its dark side, and sets out on a mission that will take him deep into show business.