Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Carnival Phantasm (カーニバル・ファンタズム, Kānibaru Fantazumu) is a comedy OVA series based on the Type-Moon gag manga, Take-Moon (テイク・ムーン, Teiku Mūn) by Eri Takenashi, the author of Kannagi: Crazy Shrine Maidens. The OVA series was created by Type-Moon to celebrate the company's 10th anniversary. The series focuses on funny and absurd situations happening to the various characters of the Type-Moon franchises, mostly from Fate/stay night and Tsukihime.
This section needs expansion. You can help by adding to it. (March 2015)
OVA
The anime is produced by Lerche studio and directed by Seiji Kishi, produced by Yūji Higa, written by Makoto Uezu and music by Yasuharu Takanashi. The anime were released in seasons which each season contain 4 episodes. The first season was released on August 12, 2011, the second season on October 28, 2011 and the third season on December 31, 2011. An extra episode titled "Carnival Phantasm EX Season" was released together with the omnibus version of the Take-Moon manga on November 26, 2011.