The name Keiyaku is a Zen Buddhist name meaning Jewel Medicine.


Also Keiyaku (The Contract) is the first song in The Most Beautiful DEATH in the World. The lyrics to the song are in the story tab. Lyrics
(Sebastian) Agake Kutsujoku ni mamire
Tsukame Sono kumo no ito wo
Soe Zetsubou no fuchi wo
Nogare Furidashi ni modore

Kokkei na anata Azakeru tsuki wo
Uchiotosu koto mo Dekiru

Kono na wo yobeba ii Ima sugu ni
-blocked-ushuu no negai wa Kanau deshou
Furueru tamashii to Hikikae ni
Keiyaku wa musubare Anata wa MY LORD

Tsuzuku Ryoujoku no hate ni
Warae Fujouri na hibi wo

Waishou na anata Togameru kami wo
Fumitsubusu koto mo Dekiru

Sasagete amasazu ni Nomihosou
Anata no sashidaa Sono tamashii
Akuma ni kashizukare Mamorareta
Itoshiki yakusoku no Houshuu

Kono na wo yobeba ii Ima sugu ni
-blocked-ushuu no negai wa Kanau deshou
Furueru tamashii to Hikikae ni
Keiyaku wa musubare Anata wa MY LORD

English Translation
(Sebastian) Struggle, smeared with humiliation.
Take that spider thread,
escape the pit of despair
and go back to the start.

I can even shoot down the moon
that is sneering at your ludicrousness.

Call my name right now,
and your wish of revenge will be granted.
In exchange for your trembling soul
the contract is made, and you are My Lord.

Jeer at those irrational days
at the end of your lasting disgrace.

I can even crush the god
that is chastising your pettiness.

I will hold up the soul that you offered me
and drink it to the last drop.
A reward for the pitiable promise,
served and protected by a demon.

Call my name right now,
and your wish of revenge will be granted.
In exchange for your trembling soul
the contract is made, and you are My Lord.