Akari Mizunashi, together with her companions Aika and Alice, is undergoing rigorous training to become a Prima Undine – a proficient guide and gondolier – in the peaceful confines of Neo Venezia. Despite working for different firms, the three are inseparable as they endeavor to improve their guidance capabilities and uncover the enigmas of the captivating Neo Venezia. In the course of their routines, they chance upon remarkable and unforgettable persons while exposing the city's unexplainable charm. Welcome to Neo Venezia, where miracles are nurtured through the simple touch of a hand.