Centuries of falling birthrates have left humanity outnumbered by the fairies, ten-centimeter, sweets-obsessed creatures whose cheerful chaos hides technology no human can match. A UN mediator known only as 'I' returns to her home village to take up a post at the mediation office her grandfather has run for years, expecting an easy assignment. This manga follows her first attempt to greet the local fairy colony on friendly terms, which spirals into one absurd incident after another.