The Happiest In The World!

Kotaro Sano, an otaku and former social recluse, had his world opened up thanks to meeting the somewhat obscure idol, Kei Miyamoto. Just as he was thinking about Kei, who had retired from show business, he ran into him by chance at a beef bowl shop! Flustered, Sano was then hit with an outrageous request from Kei...?! A "happiest-in-the-world" dream life, sparked by a reunion with his former "fave", begins now!
Source: Shueisha's Manga Million