The January 2018 issue of Monthly Comp Ace is out in Japan today, and this one has a big bonus from Saga of Tanya the Evil.
The February issue, out December 26th, will also have a 100 page supplement.
This has 100 pages of bonus material from Chika Toujo, author of the main manga adaptation, Kyouichi’s Yojo Senki Shokudo spin-off manga, concerning Tanya the Evil’s eating habits, and a manga adaptation of the “Rerugen no Itsuu” drama CD from volume 7.