Barrier

Barrier is the block between the garden and outside in Overlawn it was created by the quantum fluctuation during the war.

Overview
Anyone can go in through the barrier freely, but it's hard to go out again.

Way To Go Out
Those who has the power of one human soul is able to go out through the barrier. The power that adds one plant soul add one dark green zombie soul is just equivalent to the power of one human soul.

Way To Break
To break the barrier needs the power of seven human souls. When the protagonist's LOVE reaches 20, the power of his soul is just equivalent to the power of seven human souls.