Fate/Extra CCC

Waking up in a strange virtual world with no recollection of the past, Hakuno finds himself forced to fight for survival in a war he does not understand for a prize beyond value; the opportunity to have one's wish granted. With only an enigmatic "Servant" by his side, Hakuno Kishinami will have to face both friends and foes in battles to the death in order to not only gain possession of a mysterious object known as the "Holy Grail," but also to find the answer to the most important question of all: "Who am I?"

The series is set on the Far Side of the Moon Cell, where BB used her abilities to create the Sakura Labyrinth. She brought over various Masters and Servants from the Moon Cell Holy Grail War on the Near Side, some taken instantly before their deletion and others brought during the sixth week. (Source: Type-Moon Wikia)

A trial manga from Seijin Takenoko starring Nero Claudius as Hakuno's Servant, that ran in the March and April 2013 issues of Comptiq.

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.

A gag manga featuring numerous characters from various Type-Moon works in a school setting.

Once, there was a large war. The war ended, and the world became peaceful. Now, anyone has a "Holy Grail" and summons a Servant bound to their fate. There is only one girl, Utsumi Erice who doesn't have one. This girl encounters the last Servant summoned into the world, a boy. But, she has no idea what her fate shall be.

The stage is set on an ocean oilfield base, Seraphix. A hell that tries to imitate the Holy Grail War of the Moon. A pleasure prison that you can never escape from unless you're the last one standing. There's not much time until it reaches the limit and collapses. What lurks within the depths of the "Ego" that desires to dance --- This is the adaptation of the Epic of Remnant Chapter 1.5 from the mobile game, Fate/Grand Order.