This set of manga are collections of officially published fan-comics, or doujinshi, with stories produced by a range of different artists. This manga is the first Phoenix Wright manga to be made officially available in English. As with the range of artists, the stories range from comedy to serious short stories or 4-koma (stories consisting of 4 panels, usually gags).

The Title was published in Japan by Capcom Comics in 4 volumes (28th Mar to 28th Sept, 2006)
Later, DelRey licensed this for the US in 2 omnibus volumes 23rd September 2008 & 24th February 2009
The series also had combined single volume reprint in Japan released on 25th March 2010

An Overview (of the DelRey omnibus version)

OBJECTION!
Volume 1: The Phoenix Wright Files

Only one name strikes fear into the hearts of evildoers everywhere: Phoenix Wright, Ace Attorney.

Join Phoenix Wright and his adorable assistant Maya–plus Miles Edgeworth, Detective Gumshoe, Franziska von Karma, and others–as they investigate twenty intriguing cases. And find out why Phoenix Wright has devoted his life to fighting injustice!

TAKE THAT!
Volume 2: The Miles Edgeworth Files

Phoenix Wright, Ace Attorney, has faced down many clever and corrupt prosecutors in the courtroom: Winston Payne, Manfred von Karma & his whip-cracking daughter, Franziska, and Godot. But only one is his true rival: the mysterious Miles Edgeworth.

Get ready for these new stories of crime, justice, and courtroom drama!

Sources & References

• Main Landing page for the title on Ace Attorney Neoseeker - Link
• Vol 1 Index: 20 Anthology Stories and 2 4-koma shorts
  • AL
  • MAL
  • Wiki
• Vol 2 Index: 20 Anthology Stories and 2 4-koma shorts
  • AL
  • MAL
  • Wiki
• The Tracking Entries, except Mangaupdates, links to the entry for First Casebook