"Goodbye, my most beloved and precious person."

The shopping mall I stopped at with friends after school unexpectedly collapsed?!

As a life-threatening crisis loomed, a frantic wave of people scattered in panic.

A desperate, life-or-death peril closed in on even my best friend, who had continuously shielded my frail body.

I resolved to sacrifice my life in my best friend's stead, but...

"Another world... No way..."

Upon waking, I found myself in a vast, unfamiliar labyrinth.

Before me was what appeared to be a dangerous, never-before-seen creature, its mouth agape.

As I panicked over my immobile body, a voice came from out of nowhere.

"That is because you are an infant."

"...Huh?!"

And so began the fate of the girl, compelled to live in the vast labyrinth.

There, she learns the laws of this world, and once again, a life-threatening crisis approaches her best friend.

For the sake of her best friend, who lives in a different world, Sakuraya's adventure now... begins.