"Kaerenai Futari" was a song from Yousui Inoue's third album
"Koori no Sekai", released 1973.

Kanako and Momoka sang it in the fifth "Sakazaki Kounosuke no
Momoiro Folk Mura" episode in 2015

Mus/Lyr: Yousui Inoue (井上陽水) & Kiyoshiro Imawano (忌野清志郎)

TV version:

Kanji

思ったよりも 夜霧は冷たく
二人の声もふるえていました
Ah Ah Ah Ah Ah Ah
Ah Ah Ah Ah
"僕は君を"と言いかけた時
街の灯が消えました
もう星は帰ろうとしている
帰れない二人を残して

街は静かに眠りを続けて
口ぐせの様な夢を見ている
Ah Ah Ah Ah Ah Ah
Ah Ah Ah Ah
結んだ手と手のぬくもりだけが
とてもたしかに見えたのに
もう夢は急がされている
帰れない二人を残して

Ah Ah Ah Ah Ah Ah
Ah Ah Ah
もう星は帰ろうとしている
帰れない二人を残して
Uh…

Romaji

omotta yori mo yotsuyu wa tsumetaku
futari no koe mo furueteimashita
Ah Ah Ah Ah Ah Ah
Ah Ah Ah Ah
“boku wa kimi wo” to iikaketa toki
machi no akari ga kiemashita
mou hoshi wa kaerou to shiteru
kaerenai futari wo nokoshite

machi wa shizuka ni nemuri wo tsuzukete
kuchiguse no youna yume wo miteiru
Ah Ah Ah Ah Ah Ah
Ah Ah Ah Ah
musunda te wo te no nukumori dake ga
totemo tashikani mieta noni
mou yume wa iso ga sareteiru
kaerenai futari wo nokoshite

Ah Ah Ah Ah Ah Ah
Ah Ah Ah
mou hoshi wa kaerou to shiteru
kaerenai futari wo nokoshite
Uh...

Translation

The evening dew was colder than I'd anticipated
Our voices both shook
Ah Ah Ah Ah Ah Ah
Ah Ah Ah Ah
Just as I was about to say "I love..."
The street lights blinked off

The stars are heading towards home
Leaving us behind; we can't go home
Ah Ah Ah Ah Ah Ah
Ah Ah Ah Ah
The city continues sleeping quietly
Dreaming like a habit
I could see the warmth
Of our linked hands so clearly
Our dreams are being hurried on
Leaving us behind; we can't go home

Ah Ah Ah Ah Ah Ah
Ah Ah Ah
The stars are heading towards home
Leaving us behind; we can't go home
Uh...