Beautiful lyrics, thanks for the translation.
I romanized it according the to kanji posted by yamogi, I don't know Japanese that well so tell me if there are any corrections needed.
watashi no kuchibiru ga
hitotsu uso wo tsuita
sore wa sasai na riyuu karade
dare no tame demo naku
tada wo no kana jibun wo
mamoru tame dattan darou
kigatsuita kono ni wa kazoe kire me uso ni
kakomarete udoke naku natte ta
nasu sube mo naku
miageta sora kirei deshita
kimi no koto wo omoi mashita
kimi no you ni tsuyoku mae wo muite
aruite iketarato...
sonna michi no tochuu genjitsu kara migeta
arayuru itami kara mo migeta
ima wa konna dakedo itsuka risou toori no
jibun ni naru no dakara to
ii wakeshita ato de ii kagen mezameta
dekiru koto wa ima wo ikimeku koto dake datta
konna koe wa todoki masu ka ?
kimi no mune e hibiki masu ka ?
kimi no se wo ikiru michi shirube ni
kyou mo aruite masu
miageta sora kirei deshita
kimi no koto wo omoi mashita
kimi no you ni tsuyoku ma wo muite
aruite iketarato...
konna koe wa todoki masu ka ?
kimi no mune e hibiki masu ka ?
kimi no se wo ikiru michi shirube ni
kyou mo aruite masu