In the year 2212, the earth was hit by a great calamity. The dimension that separated the earth from the other world was destroyed and allowed the monsters and inhabitants of the other side to cross. This event is known as the Space Collapse.
After doing various kinds of research, scientists finally found the reason behind the Space Collapse. This phenomenon is caused by the emergence of a world from another dimension in the Milky Way galaxy and colliding with the earth.
The two worlds collided and caused a dimensional crack. After that, space collapse occurred in various countries and created a bridge connecting the earth with another world called Arcadia.
Currently, the earth could repair itself from space collapse automatically, but that wouldn't last long. After years of research, scientists have finally discovered why the two worlds collided. It happened because the earth and other worlds were in the process of merging. Sooner or later, the dimensional barrier between the two would completely collapse, and one world would be swallowed up by the other.
This process is needed because both worlds are on the verge of destruction and must devour the other to survive. But which world would eventually disappear could only be known in the future. But one thing is sure is that the more corrupt and chaotic a world is, the more likely it will become a world that will disappear.
The monsters that crossed from another world to earth were mostly fantasy creatures that usually only appeared in novels or movies. When they appeared, the monsters would destroy everything in front of them on instinct and aggressiveness. The monsters will kill residents and also damage the surrounding buildings. A big disaster with many casualties cannot be avoided every time a Space Collapse occurs. The result is a drastic population decline and changes in the earth's topography.
The military was utterly defenseless against those monsters that weren't even scratched after being hit by the tank cannons. They have done it in various ways. It started from the mass bombing using fighter aircraft to the use of nuclear weapons. But their efforts ended in vain because modern weapons did not affect the monster.
It wasn't just the monsters that invaded the earth but also the people from another world of various races. Elves, dwarves, beastmen, demons, and others. Earthlings refer to them as The Crossers.
People from another world can come to earth through the portal formed during the Space Collapse, but that doesn't apply the other way around. That's because Arcadia comes from a higher dimension than earth and is more stable because it has a great aura. It also relates to the monsters immune to modern weapons because they are affected by the rules of another world higher than earth.
Because of that, otherworldly people who had crossed over would have difficulty returning. They will stay temporarily on earth until they find a stable portal to return, and the government has provided an area for those world crossers called the Utopia Zone.
Unfortunately, not all the crossers are willing to cooperate with the earth government because they come for their purposes. Some wish to establish good relations with the natives and cooperate for the betterment of both worlds; the rest intend to invade the earth.
In the midst of despair due to the invasion of monsters and the crosser, the earth's inhabitants are blessed by an unknown creature. A voice suddenly sounded within their minds. Some say they are gods, and others say they are the system that rules the world. But no one knows about the true identity of that voice and why it suddenly gave power to the earthlings.
The so-called blessing comes from human potential itself. Humans have dark and light sides to themselves or are usually known as angels and demons. The unknown god-like creature gave humans a chance to awaken one of those powers or even both if they had such terrifying potential.
Humans can manifest their light or dark side into a weapon to fight against the monsters that invaded the earth. This incredible weapon was called the Phantasmal Object.
The weapon was more powerful than today's modern weapons and could kill monsters because it came from a different dimension. People who can awaken their Phantasmal Objects are called Realizers, and they fight using an energy source called Genesis Power.
The year 2262 and fifty years have passed since the first Space Collapse. Nowadays, everyone can become a Realizer. It was not only to fight monsters and protect the earth from the outside world's threats.
In various countries, Realizers are hailed as heroes because they use their powers to kill evil monsters like the ones in superhero movies. Many people want to become a Realizer because they consider it a noble job with many advantages and privileges. In addition, Realizer has also become the idol of children worldwide, including Tenku Okuihara, a five-year-old boy from Japan.
Tenku is a child born to a simple family from the Ibaraki area. His parents owned a small restaurant business as their source of livelihood. Tenku's family lives in Ibaraki prefecture in a quiet area. Their relationship with their neighbors is also excellent, especially with the family beside their house.
On weekends, the Okuihara family-owned restaurant will always be full of diners. Tenku's father, Naoki Okuihara, is busy cooking food for his customers. On the other hand, his mother, Hanako Okuihara, takes orders from another guest. Five-year-old Tenku sometimes helps them in the place.
"Tenku! Please clear the table by the nearby window!" Hanako called out to Tenku, sitting in front of the cashier's desk.
"I understand, mom!" Tenku quickly stood up from his chair and walked to the table his mother pointed to with a tray and a wet cloth in his hand.
Tenku excitedly cleared the table. The regular customers from the restaurant who were familiar with him smiled warmly at his hard work.
"As usual, Tenku is a diligent boy!"
"You are blessed to have a filial son like Tenku."
"You will be successful in the restaurant business in the future!"
Uncle, aunt and other customers praised Tenku in turn. Naoki and Hanako smiled warmly and felt proud to see their son. Not only is Tenku a hard worker, but also he is a smart kid.
"I don't want to be a restaurant owner. I want to become a Realizer to protect my family and this world from evil monsters!" Tenku clenched his tiny fists and said with determination. Even though he said it seriously, his cute boyish face made those who saw him laugh.
"Hahaha..." The customers laughed because they thought Tenku was joking. Becoming a Realizer is not something easy. Therefore, they did not take the words of a five-year-old boy seriously.
Naoki and Hanako could only shake their heads and smile bitterly when they heard their son's statement. Although their hearts are touched, they do not want their son to do dangerous work.
Time passed quickly, and the sun finally set. Tenku and his parents closed the restaurant and immediately returned to their house. It didn't take long for them to return on foot because the restaurant was close to where they lived. The Okuihara family's house is not far from the Tsukuba mountain area, and the atmosphere around it is very refreshing.
When Tenku and his parents arrived in their yard, a little girl ran up to them.
"Big brother!" The little girl smiled broadly and jumped into Tenku's arms.