My Childhood Friend Is Eriri

My childhood friend is Eri-chan ×

Did I get my everyday life in a crossover world wrong? √

The world was divided into inner and outer realms. The inner realms of various times and spaces formed the foundation, supporting the surface world.

A boy descended into this world, an organization of agents that had remained here, and realities from overlapping planes all came into view at this moment.

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.