Stumbled across a biwa. It’s a pretty rare Japanese instrument, despite the resurgence of its relative, the shamisen. It’s the lute-like instrument that the woman picks with the paddle. It’s nice to see groups keeping near extinct instruments alive.
The large horizontal stringed instruments are the koto. The recorder-like flute is called the shakuhachi.
The trio is called Rin. The song is called Sakura Sakura (Cherry Blossoms Cherry Blossoms).