Lời bài hát:

  Kimi no koto zenbu
Wakatte agetai keredo
Tsuraku te mo gomakasu
Itsumo egao de
But i know namida wo
Koraeteiru ne zutto
Sono mune ga
Koware sou na kurai
Tsuyogatte ite mo kimi no hitomi wo mire ba
Wakaru yo sugu ni ne you're my boyfriend
So you can lean on me
Sono omoi ha todoi teru yo
Mune no oku ni hibii teru yo
Kotoba ni dasa naku tatte
I know your heart soba ni iru yo
Ima wa tooku hanarete ite mo
Mune no koe wa kikoe teru yo
Kotoba ni dasa nakute mo wakaru yo
Zutto you're my boyfriend
Girl, i know kimi no koto
Girl, i know omou koto
Jibun wo seme teru kimi no kokoro
And i know namida wo
Misenai you ni zutto
Fuan de mune ga ibbai no toki mo
Tsuyogatteru yo ne
Kimi no hitomi wo mire ba
Wakaru yo sugu ni ne you're my best friend
So you can lean on me
Sono omoi wa todoi teru yo
Mune no oku ni hibii teru yo
Kotoba ni dasa naku tatte
I know your heart soba ni iru yo
Ima wa tooku hanarete ite mo
Mune no koe wa kikoe teru yo
Kotoba ni dasa nakute mo wakaru yo
Zutto you're my best friend
Futari no kokoro tsunagu te re boshi
Futari wo hikisaku mono nante nai
Omoi tsuduke teru doko ni ite mo
Kokoro wa tsunagatte iru kara
Yes, i know kimi no koto
And you know watashi no koto
Shinji atteru kara daijoubu
So you can lean on me
Sono omoi wa todoi teru yo
Mune no oku ni hibii teru yo
Kotoba ni dasa naku tatte
I know your heart soba ni iru yo
Tooku tooku hanare te ite mo
Mune no koe wa kikoe teru yo
Kotoba ni dasa nakute mo wakaru yo
Zutto you're my best friend.