Secret in my Heart

"'Secret in my Heart" is an original B-side, referred to as a "coupling track" in Japanese, never used in the anime, but being a bonus track bundled with the soundtrack as Blu-Ray Bonus.

It was performed by Reg (voiced by Mariya Ise).

Lyrics
Kanji= 僕はどうしてここにいる? なんのために生まれてきたのだろう

木漏れ日にかざした手は ギシギシと音を立てた その訳を知りたくて そっと目を閉じてた

遥かな穴の底で 秘密がキラリと煌いた 深く伝い降りたら 謎は解き明かされてくかも

多分始めは分かってた 分からないけど そんな気がしてる

僕は僕を探してた 迷路のように続く道 閉じられた宝箱 開く鍵はどこに

明日になればきっと 秘密のカタチが透けてくる だから今日もう少し 奥深くまで潜ってみよう

今は二度と忘れたくない日々が こんなにたくさんあって その思いをぎゅっとぎゅっと この手に握り締め…

僕が何者かは 今はまだ謎のままなのに 悲しくなどないのは なんでだろう

遥かな穴の底で 秘密はキラリと煌き続けて 深く伝い降りたら 謎は解き明かされてくかも いつか… Romaji= Boku wa doushite koko ni iru? Nan no tame ni umarete kita no darou

Komorebi ni kazashita te wa gishigishi to oto o tateta Sono wake o shiritakute sotto me o toji teta

Haruka na ana no soko de Himitsu ga kirari to kira meita Fukaku tsutai oritara Nazo wa tokiakasa rete ku kamo

Tabun hajime wa wakatteta Wakaranai kedo sonna ki ga shiteru

Boku wa boku o sagashi teta meiro no you ni tsuduku michi Tojira reta takarabako hiraku kagi wa doko ni

Ashita ni nareba kitto Himitsu no katachi ga sukete kuru Dakara kyou mou sukoshi Okufukaku made mogutte miyou

Ima wa nidoto wasuretakunai hibi ga konnani takusan atte Sono omoi o gyutto gyutto kono te ni nigirishime

Boku ga nani mono ka wa ima wa mada nazo no mama na no ni Kanashiku nado nai no wa nande darou

Haruka na ana no soko de Himitsu wa kirari to kirameki tsudukete Fukaku tsutai oritara Nazo wa tokiakasa rete ku kamo...

Itsuka... English= Why am I here? What was I born for?

My hands rustled through the trees in the sunlight I gentely closed my eyes to find out why

At the bottom of a distant hole The secret shined in my eyes If I go to the depths Maybe the mystery will be revealed

Maybe I always knew I don't know but I feel I do

I've searched myself through a complicated labyrinth Where will the key be found to solve this mystery?

I'm sure it will be the day That the secret will be unveiled So today, a little more I will dive deeper and deeper into the depths

There are so many days I never want to forget again So I treasure them tightly in my hands

Who I am, is still today a mystery Why do I not feel sad?

At the bottom of a distant hole The secret still shines brightly And when I reach the bottom The mystery may be revealed...

Some day...