I think there's an anime adaption for it. It started as a YT Rap Idol Group of sorts then there's a manga to it. Or maybe the manga came first Then came the game and anime I think. And also I thing there's a Stage Play too...You can check out the anime if you'd like. It's not your typical idol anime. It's not really idol either I can't say much cuz I only listen to their web songs on YT so I don't know much about thr anime but these two are from a group called 'Dotsuitare Hompo' and they're representing Osaka Division. The one with the glasses is called Rosho and I think his occupation is a Teacher? I don't even remember his M.C name. But the other guy is ome of my favourite character. Sasara. He's a comedian and his M.C name is called 'Tragic Comedy'. There's many other groups too. They all got their charms and occupations too. I Dare not say much cuz I don't read the manga nor do I play the game or watch the anime.
All I thinking is
"Hai domo, Dotsuitare Hompo desu-"
Meanwhile as Sasara and Rosho fuggs. I'll just imagine Rei having a father-son bonding time with his children NOTHING LEWD. Just family time