Ranked #2321

IO (Manga)


Alternative Titles

Japanese: イオ


Type: Manga
Volumes: 10
Chapters: 55
Status: Finished
Published: Aug 19, 1999 to Oct 15, 2004
Authors: Koio, Minato (Story & Art)


Score: 7.631 (scored by 1560 users)
Ranked: #23212
Popularity: #1515
Members: 3,431
Favorites: 44
1 indicates a weighted score
2 based on the top manga page. Please note that 'R18+' titles are excluded.


Taiyo Nakabiru went to Okinawa on a trip in pursuit of beautiful girls and his wish to go diving. When trying to hit upon a girl, she surprises him by saying that he killed her mother. It appears that she and her two sisters know him, even though he does not remember ever going to Okinawa before. After convincing the three sisters, Nagisa, Shibuki and Mio Miyara, to let him help them out with their work and to let him learn diving from them, Taiyo's childhood with the sisters slowly comes back to him, and certain strange events involving a mystical white whale begins to haunt them.

(Source: ANN)


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Miyara, Mio
Miyara, Mio
Miyara, Shibuki
Miyara, Shibuki
Nakabaru, Taiyo
Nakabaru, Taiyo
Miyara, Nagisa
Miyara, Nagisa
Shimabukuro, Mar
Shimabukuro, Mar
Aida, Riho
Aida, Riho

Write a review | More reviewsReviews

Oct 23, 2007
IO basically starts of as a distinctive Harem, Romantic, Comedy, but as you go on you’ll discover that there is more to this manga, once the Supernatural, Mystery element surfaces.

It follows the endeavours of your average city boy (Taiyo), who visits Okinawa, only to end up meeting 3 girls. It appears that he once was acquainted with the sisters, some time in the past, yet he can't seem to recall any of it. That’s basically how it all begins and behind what would seem like a typical Rom/Com lies a fantastic story of supernatural mystery, scuba diving and ancient relics. The way in which the read more
I found this review Helpful
Aug 11, 2008
This was one of the most unique stories that I've had the privileged of witnessing in a long time. This was a cross between harem, mystery, Romance, and sport (if you consider scuba diving a sport that is).
The story starts out with a class trip down to some tropical islands where our lead protagonist meets a girl who blames him for killing her mom. One thing leads to another and the next thing he knows he's learning how to scuba dive with some long lost, and apparently forgotten friends. Now this story really has two stages to it. It read more
I found this review Helpful


Manga: Umi no Misaki
Both of these harem manga deal with simple island life and also have amazing artwork. ^_^ 
reportRecommended by Master10K
Manga: Amanchu!
both are about scuba diving, although IO is more about mystery and supernatural while Amanchu is lighter and more fun to read 
reportRecommended by darthadam
Manga: Suzuka
This kinda feels the same:
Guy living in house (apartment) with many girls
The girl is kinda cold to the guy but also depend on him at hard times
reportRecommended by Vin-nii

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Poll: IO Chapter 55 Discussion
Laevantein - Nov 8, 2009
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Oct 28, 2:52 AM
Poll: IO Chapter 1 Discussion
Stark700 - Oct 26
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Oct 26, 9:17 PM