It's not Koha Ace! It's not the European Death Front 1945 either! Here comes a new serialization!

Farewell, Koha-Ace! (For the fourth time) The Koha-Ace series is finally running out of ideas and is about to be axed! Type-Moon fans will bear witness to Koha-Ace's final battle! You will see the tears of time... (Sixth and final entry in the Koha-Ace series, after Koha-Ace GO)

The delusions of Keikenchi, author of the Koha-Ace series, are finally a reality!? A new Holy Grail War begins in a parallel Imperial Capital during wartime! The curtain draws on a struggle between new Servants like Okita Souji and Oda Nobunaga as they battle for the Holy Grail in Japan!? (Fifth Volume of Koha-Ace, following Koha-Ace XP. Adaptation of Koha-Ace EX's Imperial Capital Holy Grail Strange Story, which would eventually become the basis for Fate/Type Redline)

Today, Fate meets its end. The fierce foe Majin Saber appears! Kohaku-san and the other Type-Moon friends are excited for the promotional competition "Type-Moon Tenkaichi Budokai" where powerful characters form tag-teams and battled it out! However, a conspiracy is brewing behind the scenes... and a new character designed by Takeuchi Takashi appears!! (Fourth Volume of Koha-Ace, following Koha-Ace EX)

We're ready to activate Super Dogeza toward basically everybody! A collection of works by the popular manga artist of Koha-Ace, Keikenchi, has finally arrived. Included in this volume are the ultra-rare collaborations with Prisma Illya, Kantai Collection and Lucky☆Star! It's a volume that's sure to get you hooked on the world of Keikenchi! (Koha-Ace side-story collection, released between Koha-Ace EX and Koha-Ace XP)

A Holy Grail War has broken out in Koha-Ace! After managing to avoid getting axed again and again, some miracle has allowed for a third volume of Koha-Ace! The mysterious new Servant designed by Takashi Takeuchi, Sakura Saber, is a storm of romance who will play an active role! We'll show you the real power of Koha-Ace. (Third Volume of Koha-Ace, following Koha-Ace+)

One year after the previous Koha-Ace, they're back at it again! The curtain draws on another disrespectful battle royale that TYPE-MOON somehow manages to tolerate! (Sequel to Koha-Ace)

A collection of short comedic stories centered around the world of Mahoutsukai no Yoru published by Kadokawa.

Koha-Ace stars Kohaku and features characters from various TYPE-MOON series. It is drawn in a super deformed style, and it is a self-aware series that constantly breaks the fourth wall. (Source: TYPE-MOON Wiki)