dare ni demo button hitotsu kakechigaete
surechigau hi ga arune
shinjiteta noni sunao ni narenai mama
hanareteiku senaka ni koe wo nakushitari

ima sugu ni tsutaetai kokoro no door no kagi wa
sono mune no naka ni aru no
makenaide nigenaide
ikusen no omoidetachi ga musubi tsuketekureru
just a key of heart

´gomenne´ to ietara kitto wakaru noni
kimi ga inakya dekinai
kitto ima goro onaji omoitaiteru
kizuna ga yondeiru yo
dakara ai ni yuku

ima sugu ni tsutaetai kokoro no door no kagi wa
kono mune no naka ni mo aru
me wo tojiru tada inoru tobira koshi ni hibiku kodou
kimi ni todoku you ni
just a key of heart

meguriai kono kiseki umareta toki mo basho mo
betsubetsu no kimi no mune ni
mayowazu ni tobikonda futari dake no monogatari
owarasenai yuuki
just a key of heart