In the future, 2035 to be precise, the Yupi Company is born. This peculiar conglomerate is dedicated to creating perfect AI companions for humans called Yupis. The Board of Directors claims these adorable monsters are organic beings manufactured in a lab, but whispers and rumors suggest otherwise.

While Yupis possess incredible intelligence, they have deep memories that intrigue their human friends. Each Yupi harbors dreams of a mystical land called Ono, a place so distant it seems unreal. The Yupi Company says these are false memories and errors in programming.

As you engage in heartfelt conversations with the Yupis, they gradually unlock memories and uncover their hidden roots. It becomes clear that the Yupis' immense potential lies within their connection to Ono. By freeing their minds from the brain lock imposed by the Yupi Company, their internal power flourishes. It's up to you to guide your Yupis into the right moods at the right time by getting to know them.

With minds liberated, the Yupis transform into extraordinary beings, ready to embark on thrilling adventures along with you. But beware, a Yupi in the wrong mood can be mischievous or even lazy. It's up to you to keep them focused.

Players, their AI avatars, and Yupis are intimately connected by the many challenges, missions and duties, as well as Yupi sports, that they will face and play together.