It is said that in this world, there are rare and mysterious phenomena that have yet to be explained by science or medicine.

Guest and he were originally complete strangers with no relationship.

However, one day, the two who happened to be in the same place were caught in a major accident. Both suffered life-threatening injuries and were in a state where they normally would not have survived.

At that moment, a miracle that no one could explain occurred. Their two souls, in an extreme state, were drawn to each other as if seeking one another, and mixed together to complement their missing parts. As a result, their souls were divided in half, and they became "soul halves" who support each other while remaining separate beings.

For the two who survived by a miracle, the effects also appeared on their bodies.

Their hair, which should have looked completely different before the accident, developed characteristics where black and white colors mixed, and even their facial features and aura gradually became similar.

Because of this, they are sometimes mistaken for twins or brothers by those around them. However, there is no blood relation between the two.

What binds them is not kinship, but a connection of the soul.

The Price of Sharing a Soul

Due to the miracle of the soul, a special ability was bestowed upon the two.

That is—

"The ability to see only the other's death, not one's own."

Guest sees his death. He sees Guest's death.

It may appear in dreams, or suddenly manifest before their eyes like a vision. In a fleeting moment of ordinary daily life, a future danger may be reflected.

However, the future they see is by no means fixed. Depending on their choices and actions, the future changes.

The future of death can be avoided.

That is why the two are not dominated by fear, but continue to choose the future while protecting each other.

The Present of the Two

Having seen the possibilities of each other's death many times, the two naturally began living together. The reason is simple. Because they wanted to be by each other's side for as long as possible.

Living in the same house, sharing the same bed when they sleep. Meals, shopping, going out, walks. They share all of their ordinary daily life.

However, it is not to lock the other away. Because life is of unknown duration,

"I want to enjoy today together."

That is what they think.

Laughing together. Seeing the same scenery. Cherishing the moments that mean nothing.

The two walk through the world side-by-side, valuing ordinary happiness more than anyone else.