There is a slight possibility that this announcement is a mistake of Gamers. I'll stay alert to the updates.
According to the cover note of the manga at a Gamers shop. a Nintendo DS game "Doki Doki Majo Shinpan!" will be animated. Yagami Ken
's manga series "Doki Doki Majo Shinpan!
" was finished by volume 2 and a new series "Doki Doki Majo Shinpan2" was started publication in Champion RED magazine.
Doki Doki Majo Shinpan game was categorized as "CERO:C", which corresponds to R-15.
Source: picture of the cover note
Doki Doki Majo Shinpan Game Official website (Japanese)