K-O-K-O-R-O donna mon dai!
K-O-K-O-R-O sore ga nan dai!
K-O-K-O-R-O sore ga mondai!
K-O-K-O-R-O kokoro no mondai!

Doushite sonna kao wo sunno? Souiu iikata ga kirai dakara!
honto mae kara mukatsuiteta muki ni natte baka ja nai no?

Shikamettsura nakittsura
nakanaori wo shitai keredo
kibun saiaku tomodaore
suki ni naru hodo iji ni natte yuku yo

Koro koro kokoro korogatte fuzakete fukurete fukidashita
wakariaeteru kara betsu ni ii
dakedo sonna ni kowai kao wo shinaide
yaranakya ikenai koto yori ima wa kimi to kenka shiteitai
kimi dake ga shitteru hontou no kimochi
kokoro no mondai kyou mo nankou de arimasu

Chotto iisugita ki mo suru na betsu ni nan mo ki ni shitenai yo
nande kou nattan dakke? Ano ne, etto, oboetenai ya

Te wo nobaseba tsukame sou na
kimi no te ga tooku ni aru yo
jettokousutaa kyuujoushou
itsumo no machi ga motto kagayaite yuku yo

Koro koro kokoro korogatte hareta me ga harebare hareteku
tama ni nara kenka mo nanka ii ne
dakara sonna kao shite terenaide
yaranakya ikenai koto yori ima wa kimi to te wo tsunaidetai
kimi dake ga shitteru hontou no kimochi
kokoro no mondai kyou mo junchou de arimasu!

K-O-K-O-R-O donna mon dai!
K-O-K-O-R-O sore ga nan dai!
K-O-K-O-R-O sore ga mondai!
K-O-K-O-R-O kokoro no mondai!

Kimi to deaeta kono hoshi de tomodachi ni nareta isshun de
dokidoki shiteiru kimochi ga daiji
dakara sonna majime ni nayamanaide
kotae wo sagashiteiru yori saki ni waracchatta hou ga ii
kimi dake ga shitteru hontou no kimochi
kokoro no mondai kyou mo kaichou de arimasu!

K-O-K-O-R-O kokoro no mondai!
K-O-K-O-R-O kokoro no mondai!