A Sister's All You Need
妹さえいればいい。
We checked 8 streaming services in India on 04 Jun 2026 at 15:04 IST
About
Itsuki Hashima is a light novelist obsessed with little sisters, strictly focusing on them when he writes his stories. Despite his personality, he's surrounded by a tight circle of friends, including a beautiful genius writer who loves him, a big-sisterly college classmate, a fellow male writer, a sadistic tax accountant, his editor, and Chihiro, his perfect younger step-brother who takes care of the housework and cooking. As the story progresses, the underlying conflicts of dreams and goals surface, as each character attempts to achieve their dreams, in their own way.
Cast
Satoshi Hino
as Haruto Fuwa
Hisako Kanemoto
as Nayuta Kani
Akane Fujita
as Kaiko Mikuniyama
Kohsuke Toriumi
as Kenjirou Toki
Manami Numakura
as Ashley Oono
Ai Kakuma
as Miyako Shirakawa
Chinatsu Akasaki
as Kirara Yamagata
Yusuke Kobayashi
as Itsuki Hashima
Tsubasa Yonaga
as Setsuna Ena
Nozomi Yamamoto
as Chihiro Hashima
Junko Minagawa
as Mitahora Mother
Kaori Mizuhashi
as Haruto's younger sister
Episodes
Season 1
I Only Need a Little Brother Who Can Cook, a Beautiful Naked Girl, and Friends I Can Relate to
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...
If Only a Miracle Would Happen
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...
As Long As It's For Research
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...
As Long As You're Working.
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...
All You Need Is to Write Novels.
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...
Having Your Media Developments Go Well Is All You Need.
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…
Adventure Is All You Need.
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.
All You Need Is Love and Friendship.
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?
Where does A Sister's All You Need rank today?
A Sister's All You Need is #1369 on the CineFlixo Daily Streaming Charts today.
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Watch A Sister's All You Need Online Free — All Episodes in HD
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About A Sister's All You Need
Itsuki Hashima is a light novelist obsessed with little sisters, strictly focusing on them when he writes his stories. Despite his personality, he's surrounded by a tight circle of friends, including a beautiful genius writer who loves him, a big-sisterly college classmate, a fellow male writer, a sadistic tax accountant, his editor, and Chihiro, his perfect younger step-brother who takes care of the housework and cooking. As the story progresses, the underlying conflicts of dreams and goals surface, as each character attempts to achieve their dreams, in their own way. Across 1 season and 12 episodes, originally airing on Tokyo MX.
A Sister's All You Need Cast and Characters
The cast features Satoshi Hino (as Haruto Fuwa), Hisako Kanemoto (as Nayuta Kani), Akane Fujita (as Kaiko Mikuniyama), Kohsuke Toriumi (as Kenjirou Toki), and Manami Numakura (as Ashley Oono). Their performances are a major reason A Sister's All You Need has built such a passionate audience.
Where to Watch A Sister's All You Need Online
Want to watch A Sister's All You Need online without paying? CineFlixo is the easiest way. Click play and the series starts in seconds. No popups, no "5 day trial that auto-charges" — just the show.
▶ Watch A Sister's All You Need NowWhy People Are Watching A Sister's All You Need
There's a reason A Sister's All You Need keeps showing up on "must-watch" lists. What makes it work is sharp comedic timing that lands consistently. If you enjoy Japonés storytelling that doesn't follow the same tired beats, this is the kind of show you'll end up recommending to friends.
Frequently Asked Questions about A Sister's All You Need
Where can I watch A Sister's All You Need online for free?
You can watch A Sister's All You Need online free on CineFlixo. Just open the page and hit play — no signup, no subscription, full HD streaming on phone, tablet, or desktop.
How many episodes does A Sister's All You Need have?
A Sister's All You Need has 12 episodes across 1 season. All episodes are available to stream right here on CineFlixo.
Is A Sister's All You Need good? What's the rating?
A Sister's All You Need holds a 7.6/10 rating based on 66 reviews — well above average.
Who is in the cast of A Sister's All You Need?
The main cast includes Satoshi Hino, Hisako Kanemoto, Akane Fujita, and Kohsuke Toriumi, plus a strong supporting ensemble.
Is A Sister's All You Need available in Japonés?
Yes — A Sister's All You Need was originally produced in Japonés and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.
When was A Sister's All You Need released?
A Sister's All You Need first aired in 2017.
Do I need an account to watch A Sister's All You Need on CineFlixo?
No. CineFlixo is free and you can watch A Sister's All You Need without creating an account. Sign-up is optional — only useful if you want a personal Watchlist or to comment on episodes.
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Frequently Asked Questions
Where can I watch A Sister's All You Need for free?
You can watch A Sister's All You Need online for free on CineFlixo. All 12 episodes across 1 season are available to stream in HD without a subscription, signup, or paywall. Just open the show page and press play.
How many seasons and episodes does A Sister's All You Need have?
A Sister's All You Need currently has 1 season and a total of 12 episodes. The series status is "Ended", so the episode count may grow as new seasons are released. You can browse the full episode list on CineFlixo and continue watching from where you left off.
What is A Sister's All You Need about?
Itsuki Hashima is a light novelist obsessed with little sisters, strictly focusing on them when he writes his stories. Despite his personality, he's surrounded by a tight circle of friends, including a beautiful genius writer who loves him, a big-sisterly college classmate, a fellow male writer, a sadistic tax acc… It belongs to the Comedy, Animation genres.
In which language is A Sister's All You Need originally available?
A Sister's All You Need was originally produced in JA. On CineFlixo the show is available in its original JA audio. Check the player options on the watch page for available subtitle tracks.
When was A Sister's All You Need first released?
A Sister's All You Need first premiered on October 8, 2017 (2017). The series has since concluded its run.
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