Imouto sae Ireba Ii.

人気小説家の木月は、友人を招いてディナーとゲームの夜を催す中で、執筆の壁に直面する。

Itsuki Hashima is a popular, young novelist. However, he is obsessed with little sisters and his works seem to always include little sisters, so there's some difficulty coming up with a new series. One day, his younger step-brother Chihiro and his colleagues, Hayato Fuwa, Nayuta Kani, and fellow college student, Miyako Shirakawa show up at his apartment. They enjoy dinner, drinks, and a game. That night, Nayuta makes advances towards Itsuki, but... (Source: Crunchyroll)

裸で姉役の練習をするイツキとナユタとミヤコが出会う

Nayuta and Miyako walk in on Itsuki, who was naked in front of the bathroom mirror, trying to act out the little sister character in his new volume. Itsuki is everything to Nayuta, and Miyako secretly has some feelings for Itsuki, but Nayuta also cherishes Miyako because she showed her compassion in her time of need. Nayuta invites Miyako to the hotel she's staying at and immediately gets naked. She then asks Miyako to also get naked for some kind of research for her novel... (Source: Crunchyroll)

木月と友人たちは北海道での食事を前に、調査のために沖縄へ旅立つ

Itsuki, Nayuta, and Miyako have a hard time dealing with the cold and head down to Okinawa. The next day, they visit a remote island so Itsuki can do some research and Nayuta decides to flail around naked in the water. Miyako is awed by what she's seeing and eventually jumps into the water naked, as well. Two days later, Itsuki is invited by his illustrator to go to Hokkaido, where they try various local cuisines. However, Itsuki finds out that Setsuna had been ignoring a deadline... (Source: Crunchyroll)

バレンタインデーに奈々緒、美夜子、春斗が集まり、新しい人物が木月の所持品を調査する。

Nayuta, Miyako and Haruto gather at Itsuki's room for Valentine's Day, and Haruto tries to show off his friendship with Itsuki again. Toki then shows up with the chocolates that fans had sent to them. A few days later, a new face shows up at Itsuki's house. Itsuki was getting ready to do his final return for his taxes and all of his possessions are carefully inspected by the new figure... (Source: Crunchyroll)

月城が編集長の時季を振り切って雪那と温泉へ向かうが、そこで衝撃の光景を目撃する。

Itsuki is nearing his final deadline for volume 5 and flees from his editor, Toki, however he is immediately caught. However, Itsuki manages to escape when he runs into Setsuna and they both go to a hot springs. Setsuna felt like he was in a slump and wanted to see some asses to get some inspiration. But when they get to the inn, Itsuki witnesses something horrifying... (Source: Crunchyroll)

ItsukiはMahou Academyの漫画実写化でKaiko Mikuniyamaと出会う

Itsuki has a meeting with Kaiko Mikuniyama, the manga artist who will be doing the manga adaptation of "Mahou Academy." She looks very refined, which makes Itsuki nervous, but apparently she loves little sisters as much as he does. The group has a little celebration to celebrate the upcoming broadcast of Haruto's anime and the manga version of Itsuki's series. The group gets together once again to watch the broadcast of the first anime episode live, but… (Source: Crunchyroll)

春斗のアニメ失敗後、其月は春斗の気分を盛り上げるためにTRPGセッションを企画する

In order to cheer Haruto up after his anime was such a flop, Itsuki gets him as well as Nayuta, Miyako and Chihiro together so they can play a TRPG. Itsuki usually plays girls in games, but for some reason, Chihiro makes out their character to be Itsuki's character's little sister, which leads to Nayuta and Miyako also making their characters sisters of the other two. Haruto becomes the GM and does whatever he wants. (Source: Crunchyroll)

樹が春斗の美夜子への告白を助け、奈空が誕生日パーティーを計画する

After Haruto tells him how he feels about Miyako, Itsuki promises to help him out. Around the same time, Nayuta, who sees Miyako as an older sister, tells him that she wants to have a birthday party for her. Itsuki and Nayuta have difficulties trying to figure out what to get Miyako for her birthday, so Nayuta asks her who her favorite author is, and she responds with Itsuki. Nayuta feels jealousy toward Itsuki for the first time, since they're both authors. What was the gift that Nayuta ended up getting Miyako? (Source: Crunchyroll)

三宮海香の登場と、裸と下着のテーマ

Mikuniyama Kaiko is introduced.

問題がないことがすべてを要求する。

主人公になることさえできれば、それで十分だ。

妹がいればそれで十分？