The beautiful girl at the door turns out to be Sagiri’s classmate and class rep at school, Jinno Megumi. After a joke about how much she loves dicks, the very flirtatious “Megumin” states her purpose for being there: she wants Sagiri to come to school so she can be friends with her, like she’s friends with everyone.
Well! That’s a strong personality to contend with, but she doesn’t get her way, at least today. Sagiri never meets her in person, but only overhears her conversation with Masamune through his phone—and later, without his knowledge, through Megumi’s, leading him to say some very nice things about his “pride and joy”, Sagiri.
After that new girl encounter, Masamune jumps into an old one, Takasago Tomoe, who seems to be a classmate and/or childhood friend whose family runs the bookstore where his manga are sold.
Well, they’re offered for sale, but to Masamune’s horror, it doesn’t look like any have actually been sold. He wants Tomoe to help him out by putting them in a more prominent spot, but she doesn’t bend: if he wants better placement and sales, he has to write better stories that touch people’s hearts.
The third girl Masamune encounters is perhaps the worst, Yamada Elf, a thoroughly unpleasant, petulant, arrogant young author who couldn’t be more different from Masamune (or Sagiri for that matter). She lets her “#1 on Oricon” standing go straight to her head, believing she isn’t just the Savior of LNs, she IS light novel. Yikes!
Masamune encounters Elf trying to poach Eromanga-sensei away, something even Masamune feels would benefit his little sister, so when he goes home he’s extremely contrite and gives an offering of not-so-tasty (according to Sagiri) snacks. I don’t see Sagiri abandoning her brother anytime soon…at least until the fourth girl arrives, whom I am predicting is another artist who tries to poach Masamune, the way Elf wants to poach Sagiri.
Until then, a tiny bit of progress seems to have been made in Sagiri; she asks if her brother’s heard back from Megumi, and also tells him she’ll wash her own underwear from now on, which means she’ll have to leave her room, however briefly.