In 1983, David Da-Wei Horowitz is preparing for his bar mitzvah, which involves trying to please both his Jewish and Chinese grandmothers, while building a fallout shelter with his friend Scott. But David finds himself wishing his best friend, Hector, who Scott doesn't like, and the cute Kelli Ann could be a part of their underground bunker, too. However, that would mean that David must stand up for Hector and talk to Kelli Ann.