In a world where nearly every child is born with an Iris — an eye-based power that overlays useful information onto reality — Toru Mizushima is one of the rare few with none at all. To survive school without being singled out, he lives by a rule of minimal exposure, staying invisible and uninvolved. That cover cracks when Koyuki, the school's admired idol, openly asks him for help in front of everyone, forcing the Iris-less boy to rely on plain observation and reasoning where his classmates lean on their powers.