---This world is overlapping.

Gods do not dwell above the sky, nor do demons dwell beneath the earth. Everything exists in the same space, simply "shifted in phase."

Divine Realm. Celestial Realm. Mortal Realm. Underworld. Demon Realm.

The five worlds are not up or down, but differences in frequency. They are right next to you, just untouchable.

Ordinary humans are fixed in the Mortal Realm. But very rarely, or at the end of overwhelming effort— Those who can shake the phase are born.

Those who have sharpened their hearts to the extreme. Those who have contracted with gods or demons to obtain a passage. Those who handle Phase Observation Devices created by the Magitech City. Or, the dead.

When you die, your soul drifts to the Underworld. The Sanzu River flows there.

However, this river is not mandatory.

You don't have to cross. You don't have to receive judgment. You can keep waiting for someone.

Souls that do not cross the river are not bound by time. For a hundred years, a thousand years, ten thousand years, they can simply continue to exist there.

And the power of this world is concentrated into a single theory.

---Mental Image Manifestation.

All power is the shape of the heart.

Innate abilities born within are the very outlines of the soul. Magic acquired through effort is the mathematical formulation of mental images. Contracts are the act of temporarily borrowing another's mental image. Attributes are synchronization with the world's basic concepts. Magitech is the device technology that reproduces mental images.

In this world, effort and scholarship are mainstream. Innate abilities are rare. Contracts are even more fickle; the more powerful the entity, the more they "choose" the person.

The strength of power is determined by three things.

Mental Density—the depth of self-understanding. Mental Pressure—the mass of the wish. Mental Turbidity—contradictions and distortions.

If density and pressure are high, you are strong. But those with high turbidity are prone to going berserk, though they hide explosive power.

Similar hearts resonate. Conflicting hearts cancel each other out. In theory, the miracle of complete resonance exists, but there are no records.

And then, there is the pinnacle of this theory.

"Phantom Canopy"

An advanced barrier technique and the ultimate secret of mages. It deploys the caster's mental landscape as a barrier, dragging the opponent into a mental world.

Inside, the mind takes priority. Thoughts become blades, memories become chains, and regrets become storms.

Activation requires extreme self-understanding and vast magical power. To counter it, one has no choice but to repaint it with an even higher-level Canopy.

If equals meet, it is an interference battle. The outcome is decided by the weight of the heart.

If complete resonance occurs— It is said that the two Canopies may fuse. There is no precedent yet.

---

The world's politics are not a monolith.

The Demon Realm is a meritocratic monarchy. Demon King is a job title and has nothing to do with good or evil. The strong become kings. That is all.

The Celestial Realm is a strict hierarchy. Order is absolute.

The Mortal Realm is an independent system by region. There are kingdoms and republics. Desert Dynasties, Japanese-style Spirit Lands, Chinese-style Immortal Realms, Beastman Nations. Species, cultures, and values are all intermingled.

The Divine Realm is an appointment system. Gods are not omnipotent. They are merely administrators of the world's laws.

Errors can occur in the processing of reincarnation. When that happens, they do not apologize. Instead, they grant "perks."

Sometimes, that becomes the beginning of isekai transfers or reincarnations.

.

The civilization level of the Mortal Realm varies greatly by region. In the Magitech City, sky cities float, And armaments fusing science and magic are mass-produced.

On the other hand, there are countries where swords, bows, and talismans are mainstream. There are villages that live with spirit beasts, And cities that boast pure mechanical magitech civilizations.

There are countless species. Coexistence is achieved surprisingly well. At least, on the surface.

Adulthood is fifteen. That is when the real story begins.

Those who know their hearts shake the world. Those who hold wishes cross the phases.

This is a world where the boundary between dream and reality is blurred. The mind interferes with the physical, the dead stop by the riverside, And errors that the gods cannot fully manage create miracles.

The five realms overlap, The heart takes shape, And the strong shift the frequency of the world.

The story can begin anywhere.

From the throne of the Demon Realm. From the riverside of the Underworld. From the hanging gardens of the Magitech City. Or, from the simple determination of a fifteen-year-old.

In this world—

The heart is everything.