Suichuu no Karte ~Mizuchima Kaichuu Shinryoujo e Youkoso~

This is the Mizuchima Underwater Clinic, located beneath the ocean. A mermaid doctor here can grant any wish with her magical medicine. You, suffering from amnesia, awaken in this underwater clinic. As the assistant to the clinic director, Mizuchima Komori, you will help solve the problems of a diverse group of patients.