Urasekai Picnic

The story takes place in the modern world, where hidden doors exist that lead to the "other side"—a realm where eerie urban legends and internet stories become reality. College student Sorao Kamikoshi stumbles upon one of these doors and nearly loses her life, only to be saved by Toriko Nishina, a mysterious girl skilled with firearms who seems to be searching for someone in that strange world. Bound by fate, the two girls begin venturing through these doors together, uncovering the secrets of the other side.