It's

Mou modoranai ano hibi ni
Ima chikau kanashimi ni uchikatsu koto
Mukizu no mama koerarenai
Kimi ni mata deau tame no tabi wa
Ashiato mo moetsukite
Kimi ga itsuka oshiete kureta
Kokoro no yakudou ga karitateru
Mirai made wa ubawaretenai
Sore wo shitteru kara ikeru
Just go on!

Kimi ga hohoemu nara
Kimi ga utaeru no nara
Ore ga nozomu subete ni kaeru

Kimi ga kureta yuuki
Kimi ga kureta yasashisa
Mou me o mitsumete aruku chikara ni naru