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  After the rebellion in the Underworld was quelled, Roy and the girls returo their peaceful daily lives.

  Roy went to school with Rias, Sona, and the others—occasionally teasing Aika, Asia, and Saya during breaks.

  Back at home, he pyed games and had fun with the girls. Sometimes, they eveo the subspace to py "Bullet Hell" games.

  And at night, it was Roy's "battle" time with the girls.

  He also occasionally visited Kyoto to tease the beautiful Yasaka.

  He was enjoying his life to the fullest.

  But in his spare time, Roy would also check the system for new worlds.

  And ihere were new worlds avaible.

  ...

  The first one was Fate/stay night—the Fifth Holy Grail War.

  Roy's eyes lit up.

  He remembered the famous line: "Wherever the King's sword points, our hearts follow."

  Various titles for Saber fshed through his mind: Saber, King of Knights, Lion King—

  And a beautiful image appeared in his mind.

  It was a girl with shoulder-length golden hair, emerald green eyes, and an unyielding gaze. Her face was naturally beautiful, without the need for makeup.

  Although she etite—she exuded an air of authority, making her both dignified and adorable.

  In her daily life, she tied her hair up with a blue ribbon, looking like a noble dy from a medieval European court.

  With her hair up, she appeared elegant and refined.

  With her hair down, she seemed gentle and sweet.

  She was loyal—ho, and serious.

  She carried the pride and honor of a knight, but deep down, she was still just a girl.

  She had a voracious appetite, seemingly deprived of delicious food in her past life.

  She was obsessed with eating, g it was to replenish her magical energy, and she had a keen i in colleg recipes.

  This was Artoria Pendragon—the King of Knights.

  Roy's spirits soared.

  He felt sympathy for Artoria and all that she had endured.

  He decided to save her from her suffering.

  Roy and the girls were pying cards in the living room. He excused himself ao his room.

  He wasn't pnning on taking ah him this time—He was going to cause some chaos ieverse.

  He activated a magic circle and vanished.

  ...

  He reappeared above Fuyuki City.

  'Since I'm ieverse,' he thought, 'the first thing I should do is save Sakura.'

  After all—Sakura was so kind and adorable—He couldn't let Zouken Matou torture her.

  But then, Roy suddenly remembered something. This world was different from the others.

  It had its own guardians—the collective will of the p: Gaia and Aya.

  Would they notice his arrival—?

  He sehe world around him, but there didn't seem to be aion.

  "Heh, whatever. With my current strength—even Gaia and Aya 't do anything to me," he said fidently.

  Gaia and Aya were merely the sciousness of the phey couldn't directly intervene.

  At most, they could use their trump card, the "Heroic Spirit Summoning," to summon heroes from various eras to fight powerful enemies.

  Roy wasn't afraid of that.

  He could always threaten to destroy the phat should be enough to deter them.

  Gaia and Aya were immortal, but if the p was destroyed, they would cease to exist as well.

  Roy was right.

  His sudden appearance had indeed caught their attention.

  But they were wary of his power and chose to observe him—hoping he wouldn't harm the world.

  Roy—unaware of their observation, thought of another matter.

  Irisviel von Einzbern was so adorable—He couldn't let that idiot Kiritsugu Emiya have her.

  Although their love was said to be deep and true, Kiritsugu was willing to kill Irisviel and Illya for his twisted sense of justice.

  He didn't deserve her.

  Roy decided to intervene.

  He used the system's ability to travel to different points in time within the same world.

  He would go back to the moment when the Einzberns hired Kiritsugu, the Magus Killer.

  He vanished.

  ...

  He reappeared before a magnifit castle.

  This was the Eierritory, one of the Three Founding Families of the Holy Grail War.

  They were also one of the creators of the Holy Grail system and possessed the teology to create homunculi.

  Roy sehe presence of the current head of the Einzbern family, who was discussing something with Kiritsugu.

  Ign them, he found Irisviel.

  Irisviel had just been "born" and was still iank.

  Roy appeared beside her in a fsh.

  He frowned.

  The process of creating homunculi was cruel—ofteing in failed experiments and discarded bodies.

  He could sehe presence of tless inplete homunculi corpses in a nearby ditch.

  It was a horrifying sight.

  "This method of creating homunculi is cruel—" he muttered.

  He waved his hand, and the corpses vanished.

  Satisfied—he then focused his attention on Irisviel.

  A white light enveloped her. When it faded—Irisviel was floating in the air, dressed in a beautiful white gown.

  She had a delicate face, ruby-red eyes, and silver hair.

  She looked like a noble princess awaiting her prince.

  The newborn Irisviel was like a bnk ste, pure and i.

  But too munoce wasn't good either.

  Roy didn't want to be a babysitter.

  He imparted some on seo her, then woke her up.

  Irisviel's eyeshes fluttered, and she slowly opened her eyes.

  Her ruby eyes were filled with fusion.

  "Who are you...?" she asked, tilting her head.

  Her adorable expression made Roy's heart melt.

  "Ah! You're Daddy!" she suddenly excimed, her eyes sparkling with reition aement.

  Roy almost choked.

  Why was she calling him—Daddy?

  He hadn't taught her anything like that!

  "Um, I'm not Daddy—You should call me Onii-, Irisviel," Roy expined awkwardly.

  "No, you're Daddy," Irisviel insisted.

  Based on the knowledge Roy had given her, she believed that the first person she saw upon waking up was her father.

  "No, no, no! Call me Onii-, or Roy is fioo," Roy corrected her.

  "No, Daddy!" Irisviel was stubborn.

  Roy sighed i. "Sigh, Fine—call me whatever you want."

  He decided not to dwell on it any longer.

  He had sehe approach of several homunculus mages.

  They had discovered him.

  But he didn't care. He nning to meet with Kiritsugu and the Einzbern head anyway.

  He took Irisviel's hand and led her out of the room.

  They entered a group of mages in the hallway.

  "Who are you?!" the leader demanded.

  "You don't o know. Take me to your leader," Roy replied calmly, tinuing to walk towards them.

  But the mages didn't listen. They attacked.

  Roy simply chuckled and snapped his fingers.

  Snap!

  The mages froze in pce.

  They then stepped aside respectfully, and the leader led the way.

  In an instant, the hostile mages had bee obedient servants.

  Of course—this was just a simple trick for Roy.

  trolling homunculi was child's py for him.

  Irisviel—watg from behind, was filled with admiration.

  Although she had some basiowledge, everything was still new and fasating to her.

  ...

  They arrived at the feren where Kiritsugu and the Einzbern head were meeting.

  Roy pushed the door open.

  "Didn't I tell you not to disturb me?!" the Einzbern head snapped, annoyed.

  But the mage who had led them here remained silent and stepped aside.

  Roy ehe room with Irisviel, a fident smirk on his face.

  "Hey—do you mind if I join you?" he asked casually, taking a seat on the sofa with Irisviel.

  Kiritsugu g him but didn't say anything.

  He assumed Roy was an acquaintance of the Einzbern head.

  "Who are you? How did you get in here?" the Einzbern head demanded, his expression grim.

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