See below for translation notes!

Thanks a bunch to HikarixSato0764 ([ Ссылка ]) for directing me to the following page: [ Ссылка ]
That really saved me a lot of effort in actually translating the song (since the translation on that page is absolutely stellar). That being said, I changed one or two lines slightly because I felt they could be revised, but all in all I left the translation as is.

Original Song:
人間が大好きなこわれた妖怪の唄 (Ningen ga Daisuki na Kowareta Youkai no Uta/The Song of a Broken Youkai who Loved a Human)
Circle: COOL&CREATE ([ Ссылка ])
[ Ссылка ]

Translation Notes:
• In case you're really Touhou un-savvy, a youkai is a mythical/spiritual creature in Japanese folklore. Nitori is a kappa. Kappa are youkai. Connect the dots please. Anyway, this explains why Nitori hasn't aged at all by the end of the video.
• At the end, the line 夜にとり残された (Yoru ni Tori Nokosareta) is a play on words in that にとり (ni Tori) is part of "left behind" but happens to also be pronounced the same as Nitori's name.


English Lyrics:
On the edge of a dark mist, I heard sounds in the water

Before I knew it, I was chasing after a figure I couldn't quite see

"Where are you dancing that mechanical waltz?"

"Who are you to wander in so far, not knowing?"

I was captivated, swept away by your blue eyes

There was no way I could escape

I felt broken and put back together, and lost sight of who I was

Even this coincidence, this fate is the trick of a larger mechanism

There was no way I could resist

I reached out both my arms and said, "I've fallen in love with a youkai"

In the deep dark of night, I heard mumbling sounds of water

Our fingers intertwined, I saw a dream had spilled over

"Why are you shaking? What are you afraid of?"

"Won't you tell me what's the matter?"

My green hair waved, wind-swept

"I won't ever let us be separated"

Everything was brought forward, then shattered

Swept away somewhere

Vividly, vibrantly, feverishly burning,

I couldn't come close, but 
I grasped both your hands and said, "I've fallen in love with a human"

Eventually their waltz came to a close

"Could you please forget about me, even my name?"

I lost everything, but returned, back to that place,

But I can't turn back my emotions

The stronger she wished, the further away she felt,
The youkai finally realized...

Even this coincidence, this fate is the trick of a larger mechanism

Our parting was so sudden, but in the end...

Farewell to those days I was loved! To you, I loved so much...

The song of a broken youkai

In this place with walls of white, only her heart had broken

As she searched through the mist, Nitori was left behind in the night

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