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Yakusoku Siren  
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From Psycho Pandas:

A heartrending and heartwarming story about two twins: one who hates everything like himself and one who wishes to keep his promise from long ago.


Related Series

Associated Names
The Promise Siren

Groups Scanlating

Latest Release(s)
v.1 c.6 (end) by Ii Shan Ten over 5 years ago
v.1 c.5 by Ii Shan Ten over 5 years ago
v.1 c.4 by Ii Shan Ten over 5 years ago
Search for all releases of this series

Status in Country of Origin
6 Chapters (Complete)

Completely Scanlated?

Anime Start/End Chapter

User Reviews


User Rating
Average: 8.6 / 10.0 (218 votes)
Bayesian Average: 8.33 / 10.0
 35% (77 votes)
 20% (44 votes)
 21% (45 votes)
 15% (32 votes)
 4% (9 votes)
 4% (9 votes)
 0% (1 votes)
 0% (1 votes)
 0% (0 votes)
 0% (0 votes)

Last Updated
September 3rd 2015, 11:48am PST



Category Recommendations





Original Publisher

Serialized In (magazine)
Asuka (Kadokawa Shoten)

Licensed (in English)

English Publisher

Activity Stats (vs. other series)
Weekly Pos #561 increased(+262)
Monthly Pos #1869 decreased(-16)
3 Month Pos #2589 increased(+600)
6 Month Pos #3786 increased(+595)
Year Pos #5298 increased(+461)

List Stats
On 324 reading lists
On 387 wish lists
On 543 completed lists
On 15 unfinished lists
On 180 custom lists

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Forum Posts
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User Comments [ Order by time added ]

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Very interesting~   
Rating: N/A
by cswave
August 18th, 2009, 12:39am
From the first chapter the plot seems very interesting. Mysterious but also quite comical. Another great work from Yumeka.
Looking forward to more!!
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It's Amazing!   
Rating: 10.0 / 10.0
by fisukisuki
October 25th, 2012, 9:55am
Such a touching story! smile I'm touched! Very great! So sweet! can not be described with words! ♥ Definitely THE BEST!!! VERY WORTH! No disappointed at all!
But i quite hate their parents.
Spoiler (mouse over to view)
Especially the mother! How can he forgot her own child??!! And both the parent let their 7 years old son live alone. THAT'S INSANE!!!
But i still love this manga! Forget the parents, Love the Twins! ♥ biggrin
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Didn't think much of it at the start   
Rating: 10.0 / 10.0
by hotarusasaki
May 11th, 2014, 4:03am
The start and middle was interesting enough to hold my interest but it wasn't anything too exciting to read however as I reached the last chapter or two I actually shed a few tears and I found the nice brotherly relationship just adorable (I was actually wondering if this was shounen ai at the start but its more family love than incest).
Spoiler (mouse over to view)
The ending just practically made me swoon, I loved it and it just seemed like such a lucky coincidence that the lady would find him and give him the bell yet it seemed designated by fate that he'd regain his memories through the sound of their connection.
I found it very sweet and heart warming and how I wish my brother would do that for me....
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Rating: 7.0 / 10.0
by Akatsubaki
November 12th, 2017, 8:14pm
This is the weakest series compare to any other series I've read from the author. The adults here are only to make touching story between the twin. Teacher, parents, they failed as adults. It's still a good story but not one you would expect from Sahara Mizu/Keita/Yumeka Sumomo.
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Rating: N/A
by k.bell11
July 16th, 2012, 11:01am
This manga is really sweet. Its just the right lenght for the story, the art is nice, and the brothers are adorable. The promise to make Sakuya smile 100 times is nicely done, and the ending is happy. Its not the best manga ever, but its worth the read.
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Rating: 7.0 / 10.0
by mlat26
August 13th, 2012, 5:45am
Cute story, but I really want to beat up their parents D:
Spoiler (mouse over to view)
What the heck kinda parent would leave their 7 year old son by himself at such a hard moment of their life -_- letting him believe his brother is dead and then lying to their other son about being an only child wtf? just stick the crazy lady in a hospital and take better care of the kids o:< Instead of such bad parents the author should have made them orphans or something, that would have made more sense with that kind of plot, plus they made me mad.

... Last updated on August 13th, 2012, 5:47am
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Rating: 5.0 / 10.0
by shadowwalker
August 11th, 2012, 1:05pm
i don't see what the fuss is about... this series has a high rating but doesn't deserve it in my opinion. i can't relate to the story at all also don't like the art. Story is a bit weird.. doesn't mesh with normal psychological (or even abnormal) human behaviour patters, maybe if the family of the twins had more story time and if we saw what the parents has gone through all the way.. but its just impossible to get their feelings in two pages at all. if you have never read a book on psychology you may find this entertaining but i think you'll feel something is missing in the story anyway.
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