Imouto sae Ireba Ii.

O popular romancista Itsuki luta contra o bloqueio criativo enquanto recebe amigos para um jantar e noite de jogos.

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)

Nayuta e Miyako encontram Itsuki praticando o papel de irmã enquanto está nua.

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)

Itsuki e amigos viajam para Okinawa para pesquisa antes de seguir para Hokkaido para comida

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)

Nayuta, Miyako e Haruto se reúnem no Dia dos Namorados enquanto uma nova figura inspeciona os pertences de Itsuki.

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)

Itsuki foge da editora Toki para as termas com Setsuna, mas se depara com uma cena chocante.

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 conhece Kaiko Mikuniyama para a adaptação do mangá da Mahou Academy

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)

Itsuki organiza uma sessão de TRPG para animar Haruto após o fracasso do anime.

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)

Itsuki ajuda Haruto a confessar seus sentimentos para Miyako enquanto Nayuta planeja uma festa de aniversário

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)

Introdução de Mikuniyama Kaiko e o tema da nudez e da roupa íntima

Mikuniyama Kaiko is introduced.

Não ter problemas é tudo o que é necessário.

Tornar-se o Protagonista é Tudo o Que Você Precisa.

Uma Irmã é Tudo o Que Você Precisa?