The manga includes 20 volumes, with 6 arcs cut in 24 acts, each with approximately 6 chapters.

The English names below don't come from the American Viz edition, but are a translation from either Japanese or French titles (which are faithful to the originals). If you can provide the Viz version, please send it to me, I'm interested!

Arc 1  -  Assiah

Act 1 - Electric Angel  (v01, ch01-06 = 6 ch.)
Act 2 - Crying Game  (v02, ch07-12 = 6 ch.)
Act 3 - Presumption of Guilt  (v03, ch13-18 = 6 ch.)
Act 4 - Good Bye Mother!  (v04, ch19-20 = 2 ch.)

Arc 2  -  Hades

Act 5 - A Girl in a Mask  (v04, ch21-24 = 4 ch.)
Act 6 - The Black Angel Uriel  (v05, ch25-30 = 6 ch.)
Act 7 - The Cruel Bond  (v06, ch31-36 = 6 ch.)
Act 8 - Arrival  (v07, ch37 = 1 ch.)

Arc 3  -  Jahannam

Act 09 - Angel of Furious Flame  (v07, ch38-42 = 5 ch.)
Act 10 - Chance Meeting  La Rencontre  (v08, ch43-48 = 6 ch.)
Act 11 - The Brides at the Bottom of Hell  (v09, ch49-54 = 6 ch.)
Act 12 - Monarchie Infernale  (v10, ch55-60 = 6 ch.)
Act 13 - Sacrifice  (v11, ch61-62 = 2 ch.)

Arc 4  -  Supreme Heaven, Yetzirah

Act 14 - Rabbit Hunt  (v11, ch63-66 = 4 ch.)
Act 15 - Night of the Moonlilies  (v12, ch67-72 = 6 ch.)
Act 16 - Everlasting Mid-air Passage  (v13, ch73-78 = 6 ch.)
Act 17 - Revelation  (v14, ch79 = 1 ch.)

Arc 5  -  Supreme Heaven, Briah

Act 18 - Collapse of Heaven and Hell  (v14, ch80-84 = 5 ch.)
Act 19 - Holy Inquisition  (v15, ch85-90 = 6 ch.)
Act 20 - White World  (v16, ch91-96 = 6 ch.)

Arc 6  -  Supreme Heaven, Atziluth

Act 21 - Announcement of Conception  (v17, ch97-102 = 6 ch.)
Act 22 - Buried in Ashes  (v18, ch103-108 = 6 ch.)
Act 23 - Eden  (v19, ch109-114 = 6 ch.)
Act 24 - A Hymn Most Supreme, for You  (v20, ch115-120 = 6 ch.)