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: 6.691 (scored by 39033,903 users)
1 indicates a weighted score.
Ranked: #130382
2 based on the top manga page. Please note that 'R18+' titles are excluded.
Popularity: #1861
Members: 10,158
Favorites: 31
Ranked #13038Popularity #1861Members 10,158
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Volumes: /1
Chapters: /7
Available on Manga Store
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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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 ...
Nov 15, 2015
I can't say that this plot is very original, the struggle between breaking tradition and changing for the better. Nevertheless, the story is made interesting by the incorporation of the mythical mermaid, and that is what really kept me going: the hope that Yosuke would get a glimpse of her. The thought of a mermaid egg is also peculiar and original. Otherwise, the plot moves along at a good pace over the span of seven chapters, and it is nonetheless inspiring and intriguing.

Yosuke is obviously the main character here, and he does shine as an individual. He doesn't have the strongest will in the beginning, ...
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 ...

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