Romanji
Tsuki no uragawa ni nani o kakushita no?
himitsu o tsume konda kokoro ha takarabako
itsuka kisu sarete kagi ga hiraitara
shiawase ha honto ni eien na no kashira?
Nani ka ga haji kete shimau ikki no oku no oku de dondon
soshitara mou modorenai kinou no jibun ga toozakaru
nani hitotsu tomaranai yo ikite ireba
Tsuki o miagete mo usagi ha mouinai
atari mae no koto ga naze ka totemo fushigi
Usagi ha sabishii to ikite yukenai no
hitomi ni nagareboshi sore ha namida kamo ne
Nani ka ga boya kete shimau kokoro no oku no oku de dandan
soshitara mou ugokenai jibun ga jibun de naku naru yo
tsuki ugokasu minamoto o shiritai dake
nani hitotsu tomaranai yo ikite ireba
Tsuki no uragawa ni nani o kakushita no?
piriodo kara saki ga honto no monogatari

english
What is hidden by the dark side of the moon?
filled with secrets, a heart is a treasure box.
someday being kissed, when the key unlocks it,
will the happiness really be eternal, i wonder?
Something goes and bursts repeatedly in the middle of my life.
and then i can't return, yesterday's self fades away.
i can't stop any one thing! if i am alive.
Looking up at the moon, the rabbit is timid.
why are ordinary things so strange?
The rabbit is forlorn and can't go on living.
flowing from my eyes, those are tears, i suppose
Something goes and fades gradually in the middle of my heart.
and then i can't move again, myself in me passes away.
i just want to know the source of the moon's movement.
i can't stop any one thing! if i'm alive.
What is hidden by the dark side of the moon?
the real story starts at period.