Beginning of insanity

Afternoon shadows stretched as Taiga bounced out the door, her cheerful farewells still echoing off the Emiya household's worn wooden porch.

Shirou watched her go, and the moment her figure vanished around the corner, the air inside the house thickened.

"Let's go, Saber, Ishtar(Rin)" Shirou said, his voice unnaturally steady as he prepared for tonight's battle.

Saber nodded, her armor materializing in a ripple of golden light. Rin sighed and with closed her eyes, muttering under her breath. The air shimmered as Ishtar's divine presence surged beneath Rin's skin, her eyes snapping open with predatory crimson fire.

Shirou led them out into the twilight. Fuyuki felt unnervingly ordinary—streetlights flickered on, salarymen hurried home, and Shirou walked with two beautiful companions on either side.

They moved through familiar streets with deliberate slowness. Saber scanned rooftops and alley entrances. Rin—or rather, Ishtar—strolled with deceptive casualness, humming an ancient hymn under her breath while her crimson eyes dissected every shadow.

Shirou’s remained relaxed, confident. His arms wrapped around Saber and Ishtar's waists as they walked, keeping them closer.

"So, any guess on what kind of opponent awaits us?" Ishtar's voice was a low purr, utterly incongruous with Rin's usual sharpness.

"This war so has includes a beautiful goddess, a chivalrous knight, an immortal god killer and an amazoness warrior." Shirou's fingers traced Saber's hipbone through her armor, a grounding gesture. "At this point it would be normal to for this war including aliens, time travelers or even something more outlandish."

"And Regardless of origin, they be bend to my charm." his fingers squeezed Ishtar's waist possessively. The goddess chuckled darkly, "Such arrogance, Master. But I find it... Attractive."

....

The moment Shirou Emiya spoke the word, a chain of events began to unfold—not just across the universe, but in countless parallel worlds.

In one world, a brother wished to send his sister to a place where she could find happiness.

In another, the last Master of humanity and her trusted friends began the first-ever Void Sail, hoping to escape the forces that had forcefully overtaken Chaldea.

In another, a rogue AI and her princess started their journey to escape the demonic Bodhisattva—and the Moon.

And beyond them all, countless more stories began to stir.