On an early summer night, Tian Qin—a high school girl out for a stroll—unexpectedly encounters Cygnus, a witch from another world. Stranded in an unfamiliar realm with her powers lost, the witch entrusts herself to Tian Qin, hoping the girl can help recover her missing abilities.

At the same time, an enormous tree suddenly erupts overnight in Central Park, becoming a sensational phenomenon. In just one night, their city of Longhua transforms into a bustling destination, overrun by countless visitors.

With the witch's arrival, cracks begin to form in what was once "ordinary life," as if a vast maelstrom were pulling the entire world into chaos...

[From Steam]