{{Lyrics
| group=[[Yuuhei Satellite]] (幽閉サテライト)
| titlejp=今宵インデックス
| titlerom=Koyoi Indekkusu
| titleen=This Evening's Index
| length=03:49
| arranger=Autobahn
| lyricist={{かませ虎}}
| vocalist=senya
| source=
* original title: {{lang|ja|ラクトガール　～ 少女密室}}
* source: {{EoSD}}
| album1={{LyricAlbum|今宵インデックス|YHST-0038.jpg}}
| album2={{LyricAlbum|森羅万象に触れて|YHST-0069.jpg}}

|kan1=
今宵、貴方への
インデックス
刻んで会いに行くわ
貴方がすすめた本の中に
貴方がいるようで…
|kan2=
理解したい 心から
感じたい さりげなく
同じ文字 喜びに
触れている
|kan3=
貴方が好む世界観
その様相囲まれて
溺れてく 貴方には
悟られずに…
|kan4=
今宵、貴方への
インデックス
刻んで分かち合うわ
とある物語 また貴方と
私を重ねてた…
|kan5=
叶わないとわかってる
退屈と知りながら
憂鬱が襲っても
やめないから
|kan6=
醜いでしょ 過ちが
壊れるの 慰める
美しさなど皆無
最善だわ
|kan7=
今宵、貴方への
インデックス
刻んでここへ来たわ
どんな話でも理解できる
貴方好みでしょう？

|rom1=
Koyoi, anata e no
Indekkusu
Kizande ai ni yuku wa
Anata ga susumeta hon no naka ni
Anata ga iru you de…
|rom2=
Rikaishitai kokoro kara
Kanjitai sarigenaku
Onaji moji yorokobi ni
Fureteiru
|rom3=
Anata ga konomu sekai-kan
Sono yousou kakomarete
Oboreteku anata ni wa
Satorarezu ni…
|rom4=
Koyoi, anata e no
Indekkusu
Kizande wakachiau wa
Toaru monogatari mata anata to
Watashi wo kasaneteta…
|rom5=
Kanawanai to wakatteru
Taikutsu to shirinagara
Yuutsu ga osottemo
Yamenai kara
|rom6=
Minikui desho ayamachi ga
Kowareru no nagusameru
Utsukushi-sa nado kaimu
Saizenda wa
|rom7=
Koyoi, anata e no
Indekkusu
Kizande koko e kita wa
Donna hanashi demo rikai dekiru
Anata konomideshou?

|eng1=
This evening I’ll engrave 
the index for you 
and come to see you
Inside the books you recommended me
was just you…
|eng2=
From my heart that I want to understand
I want to feel you, just casually
On the same letter for joy
I am touching it
|eng3=
The aspects of your prefered worldview
are shielded inside you
But not understood by you
who is drowning in them…
|eng4=
This evening I’ll engrave 
the index for you
and share it with you
Inside a certain story, again with you
I spinned around…
|eng5=
I know it won’t come true
Although I know it’s boring
And melancholy would attack me
because I can’t stop
|eng6=
A fault is probably unattractive
There’s just a broken consoling
Something like perfection doesn’t exist
That’s the best I can do
|eng7=
This evening I’ll engrave
the index for you
after I came here
Don’t you prefer someone that can understand you
no matter what conversation you have?

|notes= [http://stargazer.co.vu/tagged/%E4%BB%8A%E5%AE%B5%E3%82%A4%E3%83%B3%E3%83%87%E3%83%83%E3%82%AF%E3%82%B9 Translation by Maiko]
}}