Yuu Tōsaka, the adopted son of the Tōsaka family, later went to the Clock Tower for "advanced training." His original plan was for him to pursue a career as a magus after graduation... until he stumbled upon a game disc. After opening it, he entered the game's world and encountered Tiamat right at the start. [Quest: Fight alongside Tiamat] "Wait, why aren't you asking me to save Humanity?!" Yuu Tōsaka quickly discovered his blind spot, but he ultimately successfully completed the system quest and spent a wonderful time with Tiamat. ...After that, he journeyed through several different game arcs. In Britain, he was King Arthur's childhood sweetheart. During the Fourth Holy Grail War, he found a girl who adored him... her name was Sajo Aika. After finally completing the game, Yuu Tōsaka was about to put the disc away for safekeeping when, one sunny afternoon, the Heroic Spirits he had captured in the past arrived. The Knight King, Morgan the Fairy, Tiamat, the Root Princess... Looking at the unique Heroic Spirits before him, Tōsaka Yuu began to sweat profusely. "The Heroic Spirit I captured in the game... actually became real?!"

【Behind the scenes of the protagonist】

Su Yu traveled to the world of Xingtie and obtained the Mihoyo mobile game development system. His game therefore attracted attention from the entire universe.

When the player progresses to the Cocolia boss battle.

"Wildfire" sounded.

"Holy crap! This is too exciting! When the music started, I almost thought our opponent was a Star God!"

When the player progresses to the Immortal Boat.

Xianzhou players: Wherever the game is broadcast, there we will be caught in reality!

When the player progresses to the point where the firefly is pierced.

"Ah—the magic of dragon transformation is activated!"

"Danfeng, lead us in launching a Moon Drinking Rebellion!"

Before the plot

Equipped with the cheat code for Dark Dungeon, Doc Otter arrives on Terra, the land of the beast-eared girls. By equipping accessories, Otter can establish a mental link with the heroes, enabling micromanipulations like sniper operators moving five centimeters to the left... or forcibly breaking through mental barriers and taking over anyone's body! He's the protagonist, yet he's become the villainous boss... Wait? The cheat code is Dark Dungeon? No "1" suffix? That's fine. Is the protagonist and the boss the same person? Unusual? Not at all. Traces resembling an Iron Crown have been imprinted across Terra, following the footsteps of the Rhodes Island land carrier. Looking back, Otto couldn't help but sigh... There was a shark who had mistaken him for the "Lord of All Things" and who pretended to be sick from time to time to take advantage of him after waking up; a killer whale who seemed cold but was actually stupid and sold herself to him without knowing why; a self-redeeming dragon girl; a hypocritical bomb maniac; a premature bread maker; a Hippogriff female teacher with a collar and tied up all over her body... and Kal'tsit made a handgrip dynamometer gesture from a distance: A bread maker, right?

"If the Earth were shrunk to the size of a glass marble with a diameter of 1 cm, then the Sun would be about 117 meters away from the marble, a sphere with a diameter of about 1.09 meters. Coincidentally, it fits perfectly in my living room." A solar system model, a very common type of popular science textbook. Chen Ran was sure he had simply turned his head, but how did this solar system model suddenly come alive? "Terra? This planet model says Terra?" Which Terra? "Planet native detected: Skadi..." Oh, this Terra, Arknights, right? And Skadi, the killer whale. "Skadi is leading the Sea Si herd in an attempt to break through the star pod." The translucent bullet box flashed for a few seconds, completing the following paragraph. Chen Ran: "?" Wait a minute? Which Skadi is this? Which world line's Terra is this from?