As the world was on the brink of a Third World War, superheroes appeared around the globe to restore order and bring about a new era of world peace. After the threat of war ended, each hero returned to a country to help with domestic matters, where they were quickly accepted by their respective citizens. To better communicate with each other, all heroes meet at Space HQ, a space station used to oversee and discuss matters back on Earth. Much of the power and story in Shy deals with people and their "heart", which is either protected by the heroes or manipulated by the villains. Every hero is equipped with a pair of Heart-Shift Bracelets that allow them to transform their appearance from civilian to hero and communicate with others in any language. When a hero syncs their heart with the bracelets, they become the source of each hero's power and abilities by storing "Heart Power" for use when seen fit.

Set in a world where each country has its own superhero, the story follows you, as you fights alongside the heroes of Earth to ward off evil and keep world peace, all while learning to control your severe shyness and to deal with the fears and uncertainties that come with being a hero. The main threat is the supervillain group Amarariruku, led by its leader, Stigma.

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