The 4th year of the Keian era, Edo period. Several decades have passed since the end of a turbulent, blood-soaked era. People are enjoying peace and tranquility. However, a battle between seven pairs of masters and servants is about to unfold as the ritual of the waxing moon takes shape in the shadows. Miyamoto Iori, a young man in Asakusa, finds himself caught in the chaos of a Grail War.

In the ritual of the waxing moon, seven pairs of masters and servants, historical heroic spirits with overwhelming power, compete for the all-powerful wish-granting vessel - the container of the waxing moon. Only one pair can emerge victorious from the ritual. Experience the fierce battle in Edo from the perspective of Miyamoto Iori, a ronin, and his servant Saber, who suddenly appears before him.

An action role-playing game where you can explore the cities of Edo. Feel the bustling atmosphere of Edo, where traditional houses, samurai residences, and brothels can be seen. Experience the story surrounding the ritual of the waxing moon, meet various characters, explore different cities, and take on a variety of quests.

Masters and servants fight as a unit. Switch between controlling a master and a servant to battle enemy servants and gigantic monsters. Unleash Link Strikes and Affinity techniques to turn the tide in combat and survive the ritual.