It is 2150 in M-City, a society without gender where everyone uses the pronoun ish. When two historians discover an abandoned millennium-era house, they hatch a plan to turn the building into a museum that re-enacts life in the year 2000. The historians gather a group of locals, including a student, an engineer, and a community elder, to restore the building and animate the site for local visitors. Together, the volunteers explore the fashion, furnishing, and family roles of their millennial forebears, all through the lens of binary gender roles. But the project turns risky when one of the historians and the youngest volunteer start to explore illegal sexual acts in secret. When the others discover what they've been up to, they must decide if the project can go ahead or if it threatens to upend the values of their society.