Third season of Fate/Grand Order: Fujimaru Ritsuka wa Wakaranai.

The Gene Lock, a mysterious and revolutionary technology that enhances human capabilities in speed, strength, and senses to unprecedented levels. Those who successfully unlock their Gene Lock become agents of the new era, with the most outstanding among them known as Gun Gods. A fierce struggle ensues over this new weapon, leading to the establishment of academies to train agents. As experiments break through and are applied, coupled with coercion from a mysterious race, the world is gradually plunged into the quagmire of war... After the war ends, the mysterious race vanishes, and the agents and Gun Gods become unverifiable urban legends. The two remaining major agent organizations, Deep Sea and Wild Serpent, relocate their bases to the seabed and underground, respectively, maintaining a secluded existence. However, beneath this peaceful facade, danger lurks everywhere. (Source: Bangumi, translated)

During the night of July 12 in 1917, plenty of strange visions appeared, such as sun and moon shined together, waves and tides turned continually and so on. Dense clouds started darkening the sky, while buildings collapsed one after another in a sudden. In a while, the whole world fell into a crisis. Three grave-robbing aristocratic family, Zhang, Han, Cao, joint hands to solve this huge puzzle and save the world. Among them, the young master, Zhang Tianqi, who was kind and honest, with his team, had suffered from a lot of troubles in order to save the world in danger, and then finally figure out the Loulan Kingdom's secret. Loulan, with thousand years' secrets, had a grand and treacherous tomb, which almost dragged the team into death. So, what's the relationship between the mysterious visions and the Louland tomb? A story across millenniums is now beginning...

A futuristic world of a special agent academy ignites the winter of 2017! The secrets of Deep Sea Academy are about to be revealed! Sowing discord! Who exactly is CT17? Betrayal! Did Raya ultimately turn evil? Despair! What happened to Xiu in the end? Destiny! What is the true relationship between Xiaoshuai and Jill? Loyalty! Are Jill and Final just ordinary superiors and subordinates? Negligence! What's going on with Deep Sea security? Jill can freely enter and exit as Leona? Satisfaction! What will happen after Xiaoshuai wins Ling Yixiao's heart? Continue the fight! Today, break through the fog and achieve godhood with a single shot! (Source: Bangumi, translated)