The BEST Episodes of A Sister's All You Need

Every episode ever - ranked by fan votes!

Last Updated: Jul 29, 2020

Network: Tokyo MX

This is the story about the daily life of a young siscon novelist, Itsuki Hashima with his perfect little brother Chihiro, the genius illustrator Nayuta Kani, his best friend Shirakawa Kyoto and some insane partners from his publishers.

Becoming the Protagonist Is All You Need.

#1 - Becoming the Protagonist Is All You Need.

Season 1 - Episode 11 - Aired Dec 17, 2017

Itsuki asks Miyako to take something to the publisher’s for him and she runs into Nayuta’s editor. Miyako tells her that she will go see Nayuta and get her to finish the manuscript in person, and her editor thanks her. Miyako then realizes that she might want to be an editor herself. To celebrate his new volume being released, Itsuki has his friends come over and they all play the game “Once Upon a Time” and chaos ensues.

star 7.84
19 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
A Sister's All You Need?

#2 - A Sister's All You Need?

Season 1 - Episode 12 - Aired Dec 24, 2017

Itsuki falls asleep at the kotatsu and has a dream. He dreams about his darker middle school days. His mother had just died and he falls in love with a certain girl, but... Back in modern time, Itsuki celebrates his book becoming an anime and has a mixer at his apartment. Haruto brings over a board game about being a light novel artist and they all play. What kind of results will they all get in the end?

star 7.45
22 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
A Lack of Problems Is All You Need.

#3 - A Lack of Problems Is All You Need.

Season 1 - Episode 10 - Aired Dec 10, 2017

Chihiro starts working part time at Ashley’s office. Chihiro cleans Ashley’s whole office and then goes to take a bath and Ashley finds out Chihiro’s “secret.” Meanwhile, Itsuki heads to the zoo with Nayuta so he can do some research for his next book and they observe all the naked animals. He then goes to the aquarium with Chihiro and then takes Chihiro home in a taxi and...

star 7.40
20 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
Nudity and Underwear Are All You Need

#4 - Nudity and Underwear Are All You Need

Season 1 - Episode 9 - Aired Dec 3, 2017

Toki brings Itsuki the manuscript for the Mahou Academy manga. Itsuki was looking forward to what Kaiko had drawn because of her art quality, but there was a problem. Itsuki is unable to get over this problem and goes to confront Kaiko. Setsuna then shows up and has a manga battle with Kaiko on who will do the manga version of Itsuki’s book.

star 7.29
17 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
Adventure Is All You Need

#5 - Adventure Is All You Need

Season 1 - Episode 7 - Aired Nov 19, 2017

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.

star 7.20
20 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
Having Your Media Developments Go Well Is All You Need.

#6 - Having Your Media Developments Go Well Is All You Need.

Season 1 - Episode 6 - Aired Nov 12, 2017

Itsuki has a meeting with Kaiko Mikuniyama, the manga artist who will be doing the manga version 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…

star 7.16
19 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
All You Need Is Love and Friendship

#7 - All You Need Is Love and Friendship

Season 1 - Episode 8 - Aired Nov 26, 2017

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?

star 7.11
18 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
If Only a Miracle Would Happen

#8 - If Only a Miracle Would Happen

Season 1 - Episode 2 - Aired Oct 15, 2017

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...

star 7.08
24 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
I Only Need a Little Brother Who Can Cook, a Beautiful Naked Girl, and Friends I Can Relate to

#9 - I Only Need a Little Brother Who Can Cook, a Beautiful Naked Girl, and Friends I Can Relate to

Season 1 - Episode 1 - Aired Oct 8, 2017

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...

star 6.89
27 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
All You Need Is to Write Novels.

#10 - All You Need Is to Write Novels.

Season 1 - Episode 5 - Aired Nov 5, 2017

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 ryokan with the hot springs, Itsuki witnesses something horrifying...

star 6.75
16 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
As Long As It's For Research

#11 - As Long As It's For Research

Season 1 - Episode 3 - Aired Oct 22, 2017

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...

star 6.70
20 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka
As Long As You're Working.

#12 - As Long As You're Working.

Season 1 - Episode 4 - Aired Oct 29, 2017

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...

star 6.30
20 votes
Directors: Shin Oonuma
Writers: Yomi Hirasaka