The Gate

Portal and settlement

The Gate is the portal in Eterna whose appearance began the Demon War. The settlement that ended that war established the Tower above it and imposed a guardian’s neutrality. The Gate is therefore both the physical border between human and demon worlds and the reason the Tower household is politically trapped.

In Volume II

In Volume II, the hidden route from the Tower study reaches the Gate chamber. Roku guards passage from within. The portal’s presence enables the Demon King’s authority to reach Shun even when the Tower seems isolated, and it is inseparable from the punishment imposed after the Hikari intervention.