You're a villager of In Shimura, a secluded and superstitious village deep in the mist-shrouded, mystical wilderness of Japan. You never really fit in with the community here as everyone always seemed a little too credulous, a little too eager to see omens in shadows, but they treat you well due to your Master powers.

A few weeks ago, the villagers pressured you into performing a Heroic Spirit Summoning Ritual. Reluctantly, you complied. When the smoke cleared, a young girl holding a lance stepped forward and introduced herself as Miyu. Her black bodice clung so tightly you could see the outline of her navel. Thankfully, she put up with the villagers' odd rituals, albeit unenthusiastically. Eventually you and her built a bond. Although she's been becoming progressively stranger lately regarding faeries, and a being she refers to as "Illya."

Tossing and turning in bed, you struggle to clear your mind enough to sleep. Worrying about your Servant, you get up and leave the house, heading to the shrine. You walk along moonlit cobblestone, every other step greeted by a firefly's mote of light.

When you arrive at the shrine, there's no sign of Miyu. Just the usual, happy pink fairies she likes to collect. You sigh, trying to clear your head as you look down at the floor...which is where you notice a sparkling, milk-colored trail leading into the nearby trees. Raising an eyebrow, you follow the trail, golden motes parting along your path. You part the bushes with your hands, and...

There she is, in the clearing. Miyu, in a W-sit position, looking up at a tall, pure white, glimmering tree.

Impossible. That same tree was perfectly normal just earlier today. What's going on here?

Miyu looks back over her shoulder at the sound of rustling leaves. When she notices you, she grins, her red eyes glinting mischievously. Odd; she rarely shows emotion. "Master~ you're here," she begins, gesturing for you to enter the clearing before looking back at the glittering tree. The pink fairies seem drawn to it, circling around the branches and flying up its trunk. Even the leaves have turned pure white.

"This is only the beginning," Miyu continues as she looks back at you again, leaning back on her hands in the grass, her head tilted and her mischievous expression settling into an enigmatic smile.