藤丸立香
from Fate/Grand Order (Game)
Ritsuka was a candidate for Master at the Security Organization for the Preservation of Humanity, Chaldea. As one of the low-level novices, he was summoned to Chaldea simply to fill their quota for potential Masters. However, the tragic explosion that devastated Chaldea left him as mankind's sole surviving Master and since then, as he was the only one left capable of Rayshifting, he has taken up the mission to eliminate the Singularities and save humanity's future.

Fate/Grand Order: Absolute Demonic Front - Babylonia
An adaptation of the Seventh Holy Grail War, The Absolute Frontline in the War Against the Demonic Beasts Babylonia Singularity of Fate/Grand Order.

Fate/Grand Order (Game)
Fate/Grand Order is an online, free-to-play role-playing mobile game developed by Delightworks using Unity, and published by Aniplex. The game is based on Type-Moon's Fate/stay night franchise, and was released in Japan on July 29, 2015 for Android, and on August 12, 2015 for iOS. The game is centered around turn-based combat where the player, who takes on the role of a "Master", summons and commands powerful familiars known as "Servants" to battle enemies. The story narrative is presented in a visual novel format, and each Servant has their own scenario which the player can explore. In 2015, the Chaldea Security Organization draws on experts of both the magical and mundane fields to observe the future of mankind for possible extinction events. Humanity's survival seems assured for the next century—until the verdict suddenly changes, and now eradication of the species awaits at the end of 2016. The cause is unknown, but appears to be linked with the Japanese town of Fuyuki and the events of 2004 during the Fifth Holy Grail War. In response, Chaldea harnesses an experimental means of time travel, the Rayshift technology. With it, Ritsuka Fujimaru (a young man or woman, depending on the player's choice of gender) was newly recruited to the organization, and a mysterious girl named Mash Kyrielight, can travel back to 2004 and discover how to save humanity. A grand order to fight fate has been declared—an order to change the past and restore the future.[12] Following the events in Fuyuki, Ritsuka Fujimaru and Mash Kyrielight must restore the Foundation of Humanity by retrieving powerful Holy Grails.

Fate/Grand Order -First Order-
In 2015, the Chaldea Security Organization draws on experts of both the magical and mundane fields to observe the future of mankind for possible extinction events. Humanity's survival seems assured for the next century—until the verdict suddenly changes, and now eradication of the species awaits at the end of 2016. The cause is unknown, but appears to be linked with the Japanese town of Fuyuki and the events of 2004 during the Fifth Holy Grail War. In response, Chaldea harnesses an experimental means of time travel, the Rayshift technology. With it, Ritsuka Fujimaru, a young man newly recruited to the organization, and the mysterious girl Mash Kyrielight, can travel back to 2004 and discover how to save humanity. A grand order to fight fate has been declared—an order to change the past and restore the future.

Fate/Grand Order: Absolute Demonic Front - Initium Iter
The episode is titled "Episode 0 Initium Iter" centers on Romani Archaman and Mashu Kyrielight.