Having just moved back to Ashikita, Hina Tsurugi explores the seaside town and helps the Breakwater Club president Yuki Kuroiwa untangle a fishing line. Yuki hands Hina a line for her to try fishing herself and she catches an octopus that lands on her legs. Afraid of the sea creatures there, Yuki coerces Hina into joining the Breakwater Club to get the octopus off her. The next day, Hina begins her new high school life at Umino High School intending to ditch the Breakwater Club to join the Handicrafts Club...