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Zadkiel is the archangel of freedom, benevolence, mercy, and the Patron Angel of all who forgive. Also known as Sachiel, Zedekiel, Zadakiel, Tzadkiel, Zedekul and Hesediel. Rabbinical tradition considers him to be the angel of mercy.
Zadkiel was said to be the Angel who prevented Abraham from sacrificing his son, Isaac.

In rabbinic writings Zadkiel belongs to the order of Hashmallim (equated with the Dominations or Dominions), and considered by some sources to be chief of that order (others sources name Hashmal or Zacharael). In Maseket Azilut Zadkiel/Hesediel is listed as co-chief with Gabriel of the order of Shinanim. As an angel of mercy, some texts claim that Zadkiel is the unnamed Biblical Angel of the Lord who holds back Abraham to prevent the patriarch from sacrificing his son, and because of this is usually shown holding a dagger. Other texts cite Michael or Tadhiel or some other angel as the angel intended, while others interpret the Angel of the Lord as a theophany.

Zadkiel is one of two standard bearers (along with Jophiel) who follow directly behind Michael as the head archangel enters battle. Zadkiel is associated with the color violet.

In Jewish mysticism and Western ritual magic, Zadkiel is associated with the planet Jupiter. and this angel's position in the Sephirot is fourth (which corresponds to mercy).

[Source: Good ol' Wikipedia]
Warning: I have no idea Matsumoto Jun is, nor have I ever heard his music. His use is strictly for appearance. Also, this is simply a vessel of an every day person and not meant to be the musician himself. After all, using public figures is a little conspicuous, isn't it?