Shohei is the ex front singer of "Juliet", Yaya's favourite band and also her big idol. She really admires him and feels good whenever she is near his poster at home ^^. Like the other members of Juliet he always wore much make up as you can see on the picture. After Juliets end Shohei seems to be vanished and his fans are waiting for solo projects.
Shohei also appears in the series as "Syohei Shingyoji" and is an acquaintance of Moriyama. Officially nobody knows that he's Shohei, but hey... ;) He thinks Nana has a great voice and he's also interested in her. He seems to be a pretty funny person (he has a crocodile as pet, named Elisabeth, btw), but I couldn't really get to like him yet :(