The moment that voice reached the ears of the black-haired girl, Yui, it began to quietly creak her destiny.

Although Yui herself was not yet aware of it, the whisper was stirring something that had been dormant deep within her being.

"With your power, everything can be completed. Please... lend me your strength."

The voice spread, seeping into Yui's consciousness as she fell into another world.

Yui was simply bewildered, but this whisper was the "beginning" that would set in motion the destinies of countless worlds.

[Edited from DLsite]