Ritsu Hayashida is an ordinary university student. Hobby, posting his own compositions on the video-sharing website Smile Video. The songs are sung not by a flesh-and-blood human being, but by a machine voice. One day, he hears the singing voice of HIMENO Kyoka, a classmate from the same department, and falls in love at first sight. The shy Ritsu and the shy Kyoka, their awkward feelings resonate with each other.