Letra K.O.L. de Ken Hirai original

Sora o kiku kaze wo miru itsu no ma ni ka wasureteru
Soko ni aru shiawase ni kagi wo kakete iru

Suberikomu chikatetsu no naka wa kikazatta muhyoujou
Dare mo sakebanai kishimu REERU nokoshite

Nukedasenu joutai sobietatsu shougai kakezurimawari sagasu
(key of life)
Kakaeteru mondai SUTORESU wa boudai hane naki tsubasa de fly

Kioku no naka no mirai ni te ga todoita hazu na noni
Koko ni kuru made no jikan nani ga dekita kana

Yoku aru hanashi to nagusamete yosouzu wo kakinaosu
Doko ni itemo nodo ga kawaite bakari

Usure yuku sonzai sarakedasu shuutai kono te de tsukamitoru
(key of life)
Owaranai haikai doki ni aru jun'ai atenaki ashita ni try

Tsuzukanai nintai tomedonai shinpai kakezurimawari sagasu
(key of life)
Tameiki de manpai kimi dake wa zettai hane naki tsubasa de fly

repeat
repeat