Seiren
セイレン
We checked 8 streaming services in India on 30 May 2026 at 04:34 IST
About
For high school students like Shouichi Kamita, university entrance exams and the future are common concerns. It is also during this time in life that a mysterious emotion that vexes people of all ages may begin to weigh upon one's mind—love. At this point in his teenage years, Shouichi finds three girls he could see himself having a future with: the ever-cheerful Hikari Tsuneki, who teases Shouichi without mercy, but actually has a softer side; the competitive gamer, Tooru Miyamae, who has difficulty communicating with others; and Shouichi's childhood friend, Kyouko Touno, the sometimes immature shoujo manga enthusiast. Seiren follows Shouichi's relationships with these three girls across three separate arcs, as their feelings grow from mutual interest and blossom into something more beautiful.
Cast
Seasons
Episodes
Season 1
Hikari Tsuneki, Chapter 1: Decision
Shoichi is an average guy who has trouble visualizing his future. When he sees how far ahead of him his classmate, Hikari, is in every facet of life, he makes a decision.
Hikari Tsuneki, Chapter 2: Deep in the Mountains
The girl who climbed in through Shoichi's window wasn't a ghost, but his classmate Hikari. Her appearance at the summer course rejuvenates him.
Hikari Tsuneki, Chapter 3: In the Men's Bath
Shoichi and Hikari spend more time together during the summer course and eventually end up in the men's bath together after he incorrectly calls her bluff.
Hikari Tsuneki, Final Chapter: Starry Sky
Hikari continues to ignore Shoichi after their moment at the pool, leading him to suspect he did something wrong.
Tooru Miyamae, Chapter 1: Trade
Shoichi and his two friends have been playing video games during class and talk about it has been spreading across the school. Eventually, a girl noticed them playing and enjoyed playing with them. She was secretly into video games as well. The four of them later go into town and play some karaoke and arcades.
Tooru Miyamae, Chapter 2: Versus
Two childhood friends duel out there differences over a game of GusGal.
Tooru Miyamae, Chapter 3: Brother Complex
Shouichi was invited to Miyamae's place to play some GusGal, but instead, they talked a lot more and she began to open up to him.
Tooru Miyamae, Final Chapter: Fluffy
Previously Miyamae asked Shouichi to come with her to ComiMa, a fashion and gaming convention. Now along with Shiori's custom cosplay outfits and Tomoe, all four of them go and try to sell some of their creations. After a long day, they go to dinner and ran into a classmate that happened to work there.
Where does Seiren rank today?
Seiren is #1249 on the CineFlixo Daily Streaming Charts today.
- Highest: #1249
- Top 10: 0 days
- Top 100: 0 days
Watch Seiren Online Free — All Episodes in HD
Looking for a place to watch Seiren online for free? You've landed on the right page. Seiren is a well-rated Japonés animation and comedy series from 2017 that you can stream right now on CineFlixo in high quality, no signup required.
About Seiren
For high school students like Shouichi Kamita, university entrance exams and the future are common concerns. It is also during this time in life that a mysterious emotion that vexes people of all ages may begin to weigh upon one's mind—love. At this point in his teenage years, Shouichi finds three girls he could see himself having a future with: the ever-cheerful Hikari Tsuneki, who teases Shouichi without mercy, but actually has a softer side; the competitive gamer, Tooru Miyamae, who has difficulty communicating with others; and Shouichi's childhood friend, Kyouko Touno, the sometimes immature shoujo manga enthusiast. Seiren follows Shouichi's relationships with these three girls across three separate arcs, as their feelings grow from mutual interest and blossom into something more beautiful. Across 1 season and 12 episodes, originally airing on BS-TBS.
Seiren Cast and Characters
The cast features Atsushi Tamaru (as Shouichi Kamita (voice)), Ayane Sakura (as Hikari Tsuneki (voice)), Juri Kimura (as Kyouko Touno (voice)), and Shino Shimoji (as Tooru Miyamae (voice)). Their performances are a major reason Seiren has built such a passionate audience.
Where to Watch Seiren Online
CineFlixo lets you stream Seiren online free, instantly, in HD. There's nothing to install — open the page, hit play, done. Works perfectly on Jio, Airtel, Vi networks across India and on slow mobile data thanks to our adaptive video pipeline.
▶ Watch Seiren NowWhy People Are Watching Seiren
There's a reason Seiren 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 Seiren
Where can I watch Seiren online for free?
You can watch Seiren 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 Seiren have?
Seiren has 12 episodes across 1 season. All episodes are available to stream right here on CineFlixo.
Is Seiren good? What's the rating?
Seiren holds a 7.8/10 rating based on 71 reviews — well above average.
Who is in the cast of Seiren?
The main cast includes Atsushi Tamaru, Ayane Sakura, Juri Kimura, and Shino Shimoji.
Is Seiren available in Japonés?
Yes — Seiren was originally produced in Japonés and that's the version you'll stream here on CineFlixo. English subtitles are provided when available.
When was Seiren released?
Seiren first aired in 2017.
Do I need an account to watch Seiren on CineFlixo?
No. CineFlixo is free and you can watch Seiren 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 Seiren for free?
You can watch Seiren 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 Seiren have?
Seiren 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 Seiren about?
For high school students like Shouichi Kamita, university entrance exams and the future are common concerns. It is also during this time in life that a mysterious emotion that vexes people of all ages may begin to weigh upon one's mind—love. At this point in his teenage years, Shouichi finds three girls he could se… It belongs to the Animation, Comedy genres.
In which language is Seiren originally available?
Seiren 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 Seiren first released?
Seiren first premiered on January 6, 2017 (2017). The series has since concluded its run.
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