Kunitsu-Gami (Official Lyrics)

昼は良い良い夜は怖い
宵々来るは世の罪か
眠らぬ童は手を引かれ
陰に蠢く蟲となる

十二の面は舞い踊り
笛と哭声鳴り響く
畏れを成せば夜に掴まれ
穢れの花は世を乱す
指折り数える御霊を持ち
畏れを祓い罪の血を絶てば
常しえの暁が訪れ
天つ雲居の平らかな
世を照らす日明り

十二の面は舞い踊り
笛と哭声鳴り響く
畏れを成せば夜に掴まれ
穢れの花は世を乱す
指折り数える御霊を持ち
畏れを祓い罪の血を絶てば
常しえの暁が訪れ
天つ雲居の平らかな
世を照らす日明り

English:

Day is good, good, night is scary
Does the twilight bring the world's sins?
The sleepless child is led by the hand
Becoming a worm writhing in the shadows

Twelve masks dance and whirl
Flutes and wails resound
If you yield to fear, night will seize you
The flower of defilement disturbs the world
Counting the spirits on your fingers
Purify fear and sever the blood of sin
Then eternal dawn shall come
The sun's light illuminates
The peaceful world of heavenly clouds

Twelve masks dance and whirl
Flutes and wails resound
If you yield to fear, night will seize you
The flower of defilement will disrupt the world
Holding the divine spirits counted on fingers
Purify fear and sever the blood of sin
Then the eternal dawn shall come
The peaceful realm of heavenly clouds

(Translated with DeepL.com)

This song plays during the normal ending and has a more haunting and mournful sound. It's also the main theme song. :)

Kunitsu-Kami (Official Lyrics)

 陰に隠れず出ておいで
畏れないで畏れないで
ほら爪の伸びた手の平を
しっかり握って行きましょう

傷つけあってしまっても  
離さないで話さないで
また陽の陰りが訪れて
常夜に罪が溢れても
消せない痛みと同じように
此処に印が残ってゆくから
移り行く生命の灯火が
季節の中に消えようと
今は畏れないで

傷つけあってしまっても
離れないで離れないで
また陽の光が移ろいで
人世を陰が覆っても
消せない痛みと同じように
此処に印が残ってゆくから
現世が大きく変わろうと
光と共に在りましょう
どうか穢れないで 

English

Come out from hiding in the shadows
Don't be afraid, don't be afraid
Look, take my hand with its long nails
Let's hold it tight and go

Even if we hurt each other
Don't let go, don't speak
Even when the sun's shadow returns
And sin overflows in eternal night
Just like pain that can't be erased
A mark will remain here
Though the flickering light of life
Might fade within the seasons
Don't be afraid now

Even if we wound each other,
Don't let go, don't let go.
Even when sunlight shifts again
And shadows cover human life,
Just like pain that cannot fade,
A mark will remain here.
Even if this world changes greatly,
Let us be with the light.
Please, do not become defiled.

(Translated with DeepL.com)

Lyrics to the true ending. The song has a different arrangement as well. Less spooky.