Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Nani ka ga hoshii oira Sore ga nandaka wakara nai Dakedo nani ka ga tari nai yo Ima no jibun mo okashii yo Sora ni ukabu koma ha Itsuka doko ka he ton de yuku Soko ni nani ka ga arum daro u ka Sore ha dare ni mo wakara nai Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala Ningen nante lalala lalalalala (Fade out) (Alternatively, you could just hum the lyrics).
https://lyrics.primoaccordo.net/misc-unsigned-bands/takuro-yoshida-ningen-nante.htm