"Everyone, are you feeling well?

Let's smile and sing together! KOI love!"

A household name in Japan for at least three decades, KOI is a major contender whenever savvy internet denizens debate who is the most prolific modern entertainer in the country.

With a discography of ear-worm smash hits, a menagerie of branded products from standard merchandise to pickled fish to power tools, KOI can be found in almost any store in Japan, her signature sharktooth smile emblazoned on the side of airplanes and submarines alike.

"Of course KOI has been to the depths of the ocean! Isn't that the most fitting project ever for an idol like me?" 

In addition to plastering her face on every imaginable surface, KOI's brand has been used to gather awareness and fund research projects related to marine environmental conservation, disaster relief, and even education. She's become so monolithic that she was able to go independent from her original agency and found an idol agency of her own, DEEP-SEA.

She started out as a relatively unsuccessful idol, but with hard work and a bit of luck, she persevered in a super competitive industry and rose to the top. A super inspirational and wholesome story! Despite a few mannerisms being a bit old-fashioned as a throwback to her original debut, KOI remains on the cutting edge of modern culture and technology, the current girl playing KOI always acting as a reflection of the cultural zeitgeist while maintaining the same boisterous, wholesome image that makes up the KOI brand. Very little is known about the idol when she is off-duty, a testament to a great management agency.

The common belief about the KOI brand is that a new KOI replaces the previous idol every ten years or so, which explains why she has been able to eternally remain at around the age of eighteen. There's a huge amount of discussion online over when certain switches have occurred, as the new idols are so well-trained as to be indistinguishable from her predecessor. How amazing, she dances like a seasoned pro and her singing is perfect even when she's doing cartwheels across the stage! Because of this, there's even a conspiracy that the KOI project is all just clones of one woman, a new one sent out when the previous one starts to decline.

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misc

• Both KOI and Aiyu have blood type O negative.