Romaji:

Haikei kono tegami
Yonde iru anata wa
Doko de nani wo shite iru no darou
Juu go no boku ni wa
Dare ni mo hanasenai
Nayami no tane ga aru no desu
Mirai no jibun ni atete kaku tegami nara
Kitto sunao ni
Uchi hakerareru darou

Ima makesou de nakisou de
Kiete shimaisou na boku wa
Dare no kotoba wo
Sinji harukeba ii no?
Hito tsushikanai
Korobore ga
Nan domo barabara ni warete
Kurushii nakade
Ima ikite iru
Ima ikite iru

Haikei arigatou
Juu go no anata ni
Tsutaetai koto ga aru no desu
Jibun to wa nani de
Doko e mukau beki ka
Toi tsuzukereba miete kuru
Areta seishun no
Umi wa kibishii keredo
Asu no kishi beto
Yume no fune yo susume

Ima makenai de nakanaide
Kiete shimaisou na toki wa
Jibun no koe wo
Shinji aruba ii no
Oto nano boku mo kizutsuite
Nemurenai yoru ha aru kedo
Nigakute amai
Ima ikite iru

Jinsei no
Subete ni imi ga aru kara
Osorezuni
Anata no yume wo sou datete
Lalala lalala lalala
Keep and believing
Lalala lalala lalala
Keep and believing
Keep and believing
Keep and believing

Makasou de nakisou de
Kiete shimaisou na boku wa
Dare no kotoba wo shinji arukeba ii no
Makenai de nakanai de
Kiete shimaisou na toki wa
Jibun no koe wa
Shinji arukeba ii no?

Itsu no jidai mo
Kanashimi wo
Sakete wa dore nai keredo
Egao wo misete
Ima ikite ikou
Ima ikite ikou

Haikei kono tegami
Yonde iru anata ga
Shiawasena koto wo negaimasu

English:

Dear you,
Who's reading this letter
Where are you and what are you doing now?

For me who's 15 years old
There are seeds of worries I can't tell anyone

If it's a letter addressed to my future self,
Surely I can confide truly to myself

Now, it seems that I'm about to be defeated and cry
For someone who's seemingly about to disappear
Whose words should I believe in?
This one-and-only heart has been broken so many times
In the midst of this pain, I live the present

Dear you,
Thank you
I have something to tell the 15-year-old you

If you continue asking what and where you should be going
You'll be able to see the answer

The rough seas of youth may be tough
But row your boat of dreams on
Towards the shores of tomorrow

Now, please don't be defeated and please don't shed a tear
During these times when you're seemingly about to disappear
Just believe in your own voice
For me as an adult, there are sleepless nights when I'm hurt
But I'm living the bittersweet present

There's meaning to everything in life
So build your dreams without fear
Keep on believing

Seems like I'm about to be defeated and cry
For someone who's seemingly about to disappear
Whose words should I believe in?

Please don't be defeated and please don't shed a tear
During these times when you're seemingly about to disappear
Just believe in your own voice

No matter era we're in
There's no running away from sorrow
So show your smile, and go on living the present
Go on living the present

Dear you,
Who's reading this letter
I wish you happiness

Indonesian:

Untukmu,
Yang membaca surat ini
Dimana kamu dan apa yang kamu lakukan sekarang?

Bagi saya yang berumur 15 tahun
Ada benih kekhawatiran yang tidak bisa saya beritahu pada siapa pun

Jika itu surat yang ditujukan padaku di masa depan
Tentunya aku bisa benar-benar curhat untuk diriku

Sekarang, tampaknya aku akan kalah dan menangis
Untuk seseorang yang tampaknya akan menghilang
Kata-kata siapa yang harus aku percaya?
Ini satu-dan-hanya hati yang telah patah berkali-kali

Di tengah rasa sakit ini
Saya tinggal saat ini

Untukmu,
Terima kasih

Aku punya sesuatu untuk menceritakan tentang 15 tahun kamuJika kamu terus bertanya apa dan di mana kamu harus pergi
Kamu akan dapat melihat jawabannya

Laut kasar pemuda mungkin sulit
Tapi baris perahu pada mimpi Anda
Menuju pantai besok

Sekarang, jangan dikalahkan dan jangan meneteskan air mata
Selama masa ini saat tampaknya kamu akan menghilang
Percayalah pada suaramu sendiri

Bagiku secara dewasa, ada malam tanpa tidur ketika aku terluka
Tapi pahit manis kehidupanku sekarang telah hadirAda sesuatu yang berarti segalanya