Sagiri allowed Masamune to attend the data collection trip because Elf and Muramasa (without her knowledge, through Elf) agreed to “do whatever Eromanga-sensei wants them to do” afterwards. In the final episode of Eromanga-sensei, the bill comes due.
Sagiri’s “festival” ensues, where she boots Masamune, puts the two girls in swimsuits, and makes them play Twister so they’ll strike lewd poses she can draw. It’s basically heaven for Sagiri and hell for Muramasa and Elf…but a promise is a promise. Needless to say, the session is also an excuse for healthy amounts of fanservice.
When Tomoe shows up at Masamune’s door to congratulate him on the success of his new imouto LN, I feared the worst: that Sagiri, suspicious of this new girl and jealous of her interactions with her dear brother, would somehow get Tomoe into a swimsuit as well, or worse.
Thankfully, that doesn’t happen, and the girl who, in hindsight, seems like the best fit for Masamune leaves with her clothes intact, having delivered a doujinshi of the little sister novel that is actual, no-nonsense porn…then says if Masamune gets an anime and becomes famous, she’d be happy to be his wife.
Sagiri inevitably gets hold of the material not suitable for her, and immediately sets to work drawing her own erotic drawings based on the little bit she saw. When Masamune can’t quite put into words why her drawings aren’t quite anatomically accurate, she and Elf decide the best way to settle things is by stripping Masamune naked…
If they had succeeded, would have been only fair considering how many girls have had to strip for Eromanga. But before they do, Masamune gets on the horn with Megumi, who for all her talk is just as clueless as Elf and Sagiri. It takes Muramasa sketching Michelangelo’s David to show them once and for all how to draw…that.
With the sun low and Eromanga all lewd drawing-ed out, she and Masamune bid farewell to her models for the day, adding they’re welcome to come back anytime. And this time Sagiri opens the window and gives them a proper wave goodbye, showing further progress in her attempt to overcome her shut-in-ism.
As frikkin’ wrong as it may be, it’s thanks to lewd art—the lewder the better—that Sagiri can forget about the crippling fear of being outside or interacting with other people. Her digital life is a means of creative expression and a (surprisingly) safe space in which to have rudimentary human contact.
And thanks to her brother’s uncanny ability to draw girls into his orbit, she now has a slew of flesh-and-blood friends to laugh and have fun with…as well as draw in risqué positions.