Title: Mao Dante tai Getter Robot Go (魔王ダンテ対ゲッターロボG)
Original run: 2011-08-19 (#2011-10) ~ 2011-12-19 (#2012-02)
Magazine: Gekkan Champion RED (月刊チャンピオンＲＥＤ)
Publisher: Akita Shoten (秋田書店)
Volumes: 1

2012-03-19; Mao Dante tai Getter Robot Go, Champion Red Comics (チャンピオンREDコミックス), Akita Shoten, ISBN-13: 978-4253232111 http://www.amazon.co.jp/dp/4253232116 http://www.7netshopping.jp/books/detail/-/accd/1106133188 http://www.akitashoten.co.jp/CGI/new/new_listput.cgi?key=syousai&isbn=232116






Links:
http://www.accessup.org/jmanga/7_Demon_20Lord_20Dante_20VS_20Getter_20Robo_20G/
http://love.ap.teacup.com/gahaha/445.html
http://ameblo.jp/kinokine/entry-10997294049.html
http://www.animenewsnetwork.com/news/2011-07-16/go-nagai-to-launch-dante-vs-getter-robo-g-manga

Still no scanlations of this. I think DP scanlations might do it later since they did the prequel.