In the seaside town of Oceanside, 16-year-old Ruby Gillman lives with her family, trying to fit in with humans despite being krakens. Her mother Agatha forbids her from going to prom because of its location being on a ship in the ocean. At Oceanside High School, Ruby initially refuses, but her rebellious friends Margot, Trevin, and Bliss convince her to ask out her crush Connor. Even reunite with his childhood friend Zach Loud and meet a new girl Chelsea Van Der Zee who tries to befriend Ruby.