I don't know if the romaji is written correctly, but the song's below. Alternatively, I could post it in Kanji if that helps. If anyone's got an idea, feel free to tackle it. Thanks a bunch.

https://www.youtube.com/watch?v=zyrEevqbdxE

「zutto issho da yo」to
itte kure ta kimi o omoidasu
subete wa sugiyuku toki no yume

aishi sugiru no wa mou yame ta no sa
suki na hito no chikaku ni itai kara

yogore ta mafuraa ga omoide kataru
mou, ae naku narunante

「zutto issho da yo」to
chikatta natsu no hi ga owatte
setsuna sa ni zawameku aki ga sugi
mottomo samui kisetsu owatta koi o kakaeta mama
mou, ae naku narunda ne

tatoeba mouichido de aeta nara
mata boku wa kimi o suki ni naru kara

kurushima zu ni sumu koi nante nai
mou, ae naku naru nante

zutto issho nante
naze shinji te shimat ta ndarou?
sukoshi mo utagawa zu yume o mita
motto soba ni ite yo
motodouri ni wa modore nai yo
mou, ae naku narunda ne

toki o tomeru hodo itoshi sugi ta kimi o
tsugi no kisetsu ga tsuresatte iku

「zutto issho da yo」to
chikatta natsu no hi ga owatte
setsuna sa ni zawameku aki ga sugi
mottomo samui kisetsu owatta koi o kakaeta mama
mou, ae naku narunante
mou, ae naku narunda ne