"Yasashii Suisei" (優しい彗星, lit. "Gentle Comet", English title: "Comet") is a song recorded by Japanese duo Yoasobi from their second EP, The Book 2 (2021). It was released as a stand-alone digital single on January 20, 2021, through Sony Music Entertainment Japan, and released as a double A-side CD single together with "Kaibutsu" on March 24. The song was featured as an ending theme song for the second season of the anime television series Beastars.