The Sound of Rain (雨音) is the 13th chapter of the manga series.
While taking shelter from the rain, Yuuri notices her helmet makes a pleasant noises when getting hit by the water droplets. She borrows Chito's helmet and a several of cans then positions them under dripping water. Chito also joins in by using their lamp under the water drops. Chito suggests this is what they call "Music".
- The soundtrack that is played at the ending credits of episode 5 is named after this chapter.