Kyou Kara Ma no Tsuku Jiyuugyou! 2-disc Drama CD Set
This 2-disc CD drama, based on the first of the Maruma light novels, is now out of print and very difficult to find. However, you can find a scan of the cover artwork in Newtype USA October 2004. Sorry that I don't have scans of the disc covers themselves.

Ura: Kondo wa Ma no Tsuku Saishuuheiki! (Honke Special Version)
Source: Advertisement scanned by me, and lami cards scanned by Animekitty421.

Ura: Konya wa Ma no Tsuku Dai Dassou! (Honke Special Version) // Source: Amazon.co.jp and Animekitty421.

Image Cross-Reference: Asuka February 2006 (much better scan!).

Ura: Ashita wa Ma no Tsuku Kaze ga Fuku! (Honke Special). // Source: sophiehatter and Animekitty421.

Kakka Ma no Tsuku Love Nikki?! (New Design Version) // Source: Sandraian and Animekitty421.

This is the new commercial release of the original Love Nikki Drama CD, which was only available from Kadokawa Shoten via mail-order for a short time in 2006. This new CD reproduces the original drama in its entirety, with the addition of an omake track of cast commentary.

Image Cross-Reference: Newtype Romance Spring 2007.

Ura-Ma DX New Design Version. // Source: sophiehatter and Animekitty421.

Image Cross-Reference: Newtype Romance Spring 2007, and Minna no Uta.

Maou Koutan Special
Source: ripped from Korder.com.
This is a short drama CD that tells the story of Yuuri's birthday. Sorry that I don't have a larger image yet.

Kyou Kara Ma no Tsuku Jiyuugyou! Project B
Source: scanned by me.
This is the jacket of a special drama CD that was only available as a send-away offer from Asuka magazine. Released in 2007.

Gunter Kakka no Shin Makoku Kaimin CD
Source: scanned by me.
This is the jacket of yet another special drama CD that was only available as a send-away offer from Asuka magazine. Released in 2008.

Image Cross-Reference: Asuka February 2008.

Newtype Romance 2008 Winter SHK Bonus Radio CD: See the "Wed Radio Kyoh Kara Maoh! Shin Makoku Hoso Kyokai" section below.

Source: Ripped from Marine.shop-pro.jp or Amazon.co.jp, or scanned by me.

Image Cross-Reference: For the bottom of the Volume 02 advert, see individual Character Singles albums. For the third cover, see Newtype Romance Spring 2008.

Welcome to the SHK! // Source: scanned by me.
This bonus radio drama CD was offered as a send-away bonus in the 2008 Winter issue of Newtype Romance. It comes with a DVD-style case and a bonus booklet.