《妖兽都市》不可不提的，是片中的插曲 "It's not easy"。插曲出现于片子中尾段，看了近一小时阴阴沉沉的画面、蓦地裡听到高声唱出 "My Darling"，彷佛黑夜过去、黎明将至。曾为听此插曲不断翻看动画。
"It's not easy"由冲绳女歌手當山瞳（當山ひとみ）
她还演唱过88圣斗士星矢的主题曲 YOU ARE MY REASON TO BE ～愛は瞳の中に～
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下面附上插曲 "It's not easy"的歌词，中文自己翻的，请勿见笑
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,
你想寻找新的方向
Silent moment here, tell me what you wanna say,
在这沉默的时刻，请说出你心中所想
Something has changed, now I'm a stranger to you.
事已至此，对你而言我已是个陌生人
I pray inside, oh Lord don't let this be true.
我在心里祈祷，这不是真的
Love now, fragile like a glass,
此刻爱如易碎的玻璃
Slowly crumbling down.
慢慢坍塌下来
Please make it stop.
请停下来
It's not easy, when I still love you so.
这并不容易，当我还如此爱着你
How can I say goodbye,
让我怎么说出再见
Smile and say it's just a silly joke?
笑着说这只是个愚蠢的玩笑？
My darling, before I break down and cry,
亲爱的，在我崩溃哭泣前
Oh please don't turn away.
请不要离开
Don't you understand for me?
难道你还不明白
It's not easy.
这并不容易
In the rain, I cry as I walk alone.
雨中我哭泣独行
Each time headlight shines,
每当车灯闪烁
It flashes back your loving smile.
总会浮现你那微笑的面庞
Softly, the snowflakes falls and touches my face,
飘落的雪花轻拂在我脸上
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,
告诉我痛苦终会过去
Telling me there's time, for everything.
世人皆是如此
It's not easy, but I'll get over you.
虽然这并不容易，但我终究会忘记你
Foot steps I left behind,
我身后的足迹
Melting in the snow, leaving not a trace.
已被白雪掩盖，留不下一丝痕迹
My darling, everything's covered white,
亲爱的，一切都已被白色掩盖
Oh such a pretty sight making all my pain inside,
如此美好的景象让我心中原本的伤痛
Nice and breezy.
变得美好而愉快
It's not easy?
这不容易吗
