Tropic of the Sea
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Alternative Titles

Synonyms: Return to the Sea, Summer of Tension
Japanese: 海帰線
English: Tropic of the Sea
More titles


Type: Manga
Volumes: 1
Chapters: 7
Status: Finished
Published: Mar 26, 1990 to Jun 18, 1990
Genres: Fantasy Fantasy, Mystery Mystery
Demographic: Seinen Seinen
Authors: Kon, Satoshi (Story & Art)


Score: 6.711 (scored by 35473,547 users)
1 indicates a weighted score.
Ranked: #118162
2 based on the top manga page. Please note that 'R18+' titles are excluded.
Popularity: #1863
Members: 9,034
Favorites: 27
Ranked #11816Popularity #1863Members 9,034
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Tropic of the Sea
Volume 1


Yosuke Yashiro's family has a strange, unique tradition -- once every sixty years they receive an egg from a mermaid where it sits protected in a shrine. Once the egg matures the family dutifully returns it to the sea, where the whole process is repeated. In exchange for this favor, the mer-people bless their coastal town with bountiful catches of fish and calm seas.

But as commercial developers encroach on the sleepy seaside hamlet and Yosuke's father is lured away from tradition towards modern prosperity and turns the mermaid's egg into a tourist trap, what will happen to the promise their family made to the mermaids all those years ago?

Included one-shot:
Summer of Tension


Kaikisen was published in English as Tropic of the Sea by Vertical Inc. on September 17, 2013.


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More reviewsReviews

Jul 26, 2013
Mixed Feelings
Well that was just a little heavy-handed.

Kaikisen: Return to the Sea falls into a classic trap. Is the greedy land-developer character not perceptibly evil enough despite the fact that he literally wears sunglasses indoors? Let's also have his driver almost hit the main character in his fancy car then, just to show that he really isn't someone who cares. It should be enough to let the motives and major actions of your characters speak for themselves, but sometimes authors just can't resist adding that extra little "kick."

Yes, our villain actually kicks a dog.

The absurd portrayal of the people behind the development project ruins what what ...
Nov 23, 2012
If I have to sum up Kaikisen in a few words, they would be: Mesmerizing, Serene, Euphoric, Profound, Phenomenal. A modest coastal town, the tranquil sea and an intriguing legend about a mermaid that engulfs the town. It might not be the most original setting or premise but it is done so well, the first few pages were all it took to draw me into the story.

While the manga’s charm without a doubt lies in the mystery surrounding the mermaid’s existence and her ‘egg’, the characters and their portrayal are yet another of its redeeming points. We have our protagonist Yosuke who is ...
Feb 16, 2017
Mixed Feelings
I'm usually a big fan of Satoshi Kon. Some of my favourite movies are his own creations, Paprika and Tokyo Godfathers being prime examples, and I adore his artwork. Kaikisen--or its English 'Tropic of the Sea'--is itself beautiful on paper, yet falls short while trying to convey something significant beyond the pages.

On the surface, Kon divulges a potentially profound story of a seaside town at risk of being commercialized while trying to maintain the tradition of keeping safe a mystical mermaid's egg gifted to them once every sixty years. In exchange for such care, the mer-people bless the village with warm weather and safety all ...

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