Umihara Kawase is a series of platform games, starring a nineteen-year-old Japanese school girl, Kawase Umihara who has somehow becomes lost in a world of mutated salt water and fresh water creatures. She wears her school uniform along with a bright pink rucksack. The Umihara Kawase games' main distinction is their tranquil fish and bird infested worlds and the rope physics, which defines the gameplay.