《妖獸都市》不可不提的，是片中的插曲 "It's not easy"。插曲出現於片子中尾段，看了近一小時陰陰沉沉的畫面、驀地裡聽到高聲唱出 "My Darling"，彷佛黑夜過去、黎明將至。曾為聽此插曲不斷翻看動畫。
"It's not easy"由沖繩女歌手當山瞳（當山ひとみ）
她還演唱過88聖鬥士星矢的主題曲 YOU ARE MY REASON TO BE ～愛は瞳の中に～
下面附上插曲 "It's not easy"的歌詞，中文自己翻的，請勿見笑
It's not easy
唱: 當山瞳 作詞: 當山瞳 作曲: 都志見隆 編曲: 京田誠
Once again, you're trying to find a way,
你想尋找新的方向
Silent moment here, tell me what you wanna say,
在這沉默的時刻，請說出你心中所想
Something has changed, now I'm a stranger to you.
事已至此，對你而言我已是個陌生人
I pray inside, oh Lord don't let this be true.
我在心裡祈禱，這不是真的
Love now, fragile like a glass,
此刻愛如易碎的玻璃
Slowly crumbling down.
慢慢坍塌下來
Please make it stop.
請停下來
It's not easy, when I still love you so.
這並不容易，當我還如此愛著你
How can I say goodbye,
讓我怎麼說出再見
Smile and say it's just a silly joke?
笑著說這只是個愚蠢的玩笑？
My darling, before I break down and cry,
親愛的，在我崩潰哭泣前
Oh please don't turn away.
請不要離開
Don't you understand for me?
難道你還不明白
It's not easy.
這並不容易
In the rain, I cry as I walk alone.
雨中我哭泣獨行
Each time headlight shines,
每當車燈閃爍
It flashes back your loving smile.
總會浮現你那微笑的面龐
Softly, the snowflakes falls and touches my face,
飄落的雪花輕拂在我臉上
I thought it was the hand of God from above,
我想那是上帝的指引
Telling me, that I will survive,
告訴我痛苦終會過去
Telling me there's time, for everything.
世人皆是如此
It's not easy, but I'll get over you.
雖然這並不容易，但我終究會忘記你
Foot steps I left behind,
我身後的足跡
Melting in the snow, leaving not a trace.
已被白雪掩蓋，留不下一絲痕跡
My darling, everything's covered white,
親愛的，一切都已被白色掩蓋
Oh such a pretty sight making all my pain inside,
如此美好的景象讓我心中原本的傷痛
Nice and breezy.
變得美好而愉快
It's not easy?
這不容易嗎
"It's not easy"由沖繩女歌手當山瞳（當山ひとみ）
她還演唱過88聖鬥士星矢的主題曲 YOU ARE MY REASON TO BE ～愛は瞳の中に～
下面附上插曲 "It's not easy"的歌詞，中文自己翻的，請勿見笑
It's not easy
唱: 當山瞳 作詞: 當山瞳 作曲: 都志見隆 編曲: 京田誠
Once again, you're trying to find a way,
你想尋找新的方向
Silent moment here, tell me what you wanna say,
在這沉默的時刻，請說出你心中所想
Something has changed, now I'm a stranger to you.
事已至此，對你而言我已是個陌生人
I pray inside, oh Lord don't let this be true.
我在心裡祈禱，這不是真的
Love now, fragile like a glass,
此刻愛如易碎的玻璃
Slowly crumbling down.
慢慢坍塌下來
Please make it stop.
請停下來
It's not easy, when I still love you so.
這並不容易，當我還如此愛著你
How can I say goodbye,
讓我怎麼說出再見
Smile and say it's just a silly joke?
笑著說這只是個愚蠢的玩笑？
My darling, before I break down and cry,
親愛的，在我崩潰哭泣前
Oh please don't turn away.
請不要離開
Don't you understand for me?
難道你還不明白
It's not easy.
這並不容易
In the rain, I cry as I walk alone.
雨中我哭泣獨行
Each time headlight shines,
每當車燈閃爍
It flashes back your loving smile.
總會浮現你那微笑的面龐
Softly, the snowflakes falls and touches my face,
飄落的雪花輕拂在我臉上
I thought it was the hand of God from above,
我想那是上帝的指引
Telling me, that I will survive,
告訴我痛苦終會過去
Telling me there's time, for everything.
世人皆是如此
It's not easy, but I'll get over you.
雖然這並不容易，但我終究會忘記你
Foot steps I left behind,
我身後的足跡
Melting in the snow, leaving not a trace.
已被白雪掩蓋，留不下一絲痕跡
My darling, everything's covered white,
親愛的，一切都已被白色掩蓋
Oh such a pretty sight making all my pain inside,
如此美好的景象讓我心中原本的傷痛
Nice and breezy.
變得美好而愉快
It's not easy?
這不容易嗎
