The first episode flashes back a year ago to explain why Eriri and Utaha hate each other so much. Well, we already knew it was about Tomoya, but it was related to how they discovered their alter egos.
Utaha told Eriri who she was as a light novel author, but Utaha found out for herself who Eriri was after talking with Tomoya and raiding the art club. She found doujinshi circle signature and hit the jackpot of sexy drawings.
Enter normal girl Megumi to upset this delicate détente of respect and rivalry. Tomoya had asked for Eriri's and Utaha's autograph on a drawing of their game's main heroine based on Megumi, out of pure otaku interest. Megumi asked for one out of pure friendship. I saw that little gesture of straightening Eriri's blouse to hide her bra strap. Megumi became the bridge for Utaha and Eriri to get an autograph of each other. Megumi is making a strong first move in the race for Best Girl status this season.