I, Tregear, want to be a good person in my life.

Kirisaki's few words seemed to reveal the shameful past of the three siblings.

Except for Grigio who was still immersed in painful memories, Rosso and Blue were both shocked.

They subconsciously stared at Kirisaki for a long time, and then, as if they thought of something, they looked at Grigio again thoughtfully.

"Could it be because of that incident?" The two Rossoblu brothers spoke almost at the same time.

Hinted by Kirisaki's words, they vaguely thought of an incident in the past that was enough to be considered a psychological demon for their younger sister, Grigio.

The three were born on a fragmented planet called Sanga.

There was constant war on the planet Sanga. Under the ruthless deprivation of the war, the three siblings lost their parents one day and became orphans.

They were still very young at that time, and they only knew that their parents would never open their mouths and call their names gently again.

One day, the local Baku Baba adopted the three siblings along with other orphans.

As the three grew up, Bakubaba discovered that they all possessed outstanding fighting talents, so he trained them to become professional killers.

Under Baku Baba's brainwashing, the three of them had long lost the ability to distinguish between correct concepts.

They became cold-blooded puppets with blood on their hands.

They started taking assignments and earning commissions for Baku Baba.

Time and again, he went through extremely dangerous missions, with screams echoing in his ears and his hands covered in boiling blood...

They thought that life would continue to repeat itself in this way.

But fortunately, the profession of killer did not make the three men numb.

As the younger sister, Grigio was the first to begin to doubt what they were doing.

The real opportunity that made the three of them decide to change their way of life happened on a forest planet called Easttake.

Baku Baba, who raised them, gave the three siblings a new mission.

Go to the forest planet Dongtak and destroy the guardian beast Nero.

Nero, a plant-like monster covered with green vines.

Although it is called a guardian beast, it actually protects a village on the planet Dongtak.

but……

This kind of protection is not selfless.

Nero reached an agreement with the residents of that village. Every ten years, the village would offer a villager as a sacrifice for it to devour. In return, Nero would use his own abilities to protect the village from foreign enemies during those ten years.

It was said to be a guard, but in fact the entire village was confined.

Those villagers became pigs in the pigsty. Although they could survive for a short period of time, they would be sacrificed to Nero at any time.

After the three siblings came to this planet, they learned about Nero's deeds and felt for the first time that their work had its meaning.

This mission actually gave them a sense of pleasure after killing.

But monsters are monsters after all. They are huge in size, and some even have extraordinary abilities.

At that time, the three of them were still human beings. Even if they had outstanding fighting talents, it would be impossible for them to defeat the monster head-on.

The three siblings sneaked into the village and immediately set about investigating Nero's weaknesses.

During the investigation, the three siblings met Bianca, a girl who was about to be sacrificed to Nero.

But what puzzled and surprised Grigio was that Bianca was actually very calm about being used as a sacrifice, and even felt a little proud of it.

"Sacrificing myself can keep the whole village safe for a long time. It's worth it."

"I will face it calmly like my predecessors who have dedicated themselves to this cause throughout the ages... It is an honor for me to be chosen."

The girl Bianca's words were like a needle that pierced into Grigio's heart.

As a killer who has shed countless blood, she naturally knows how fragile life is.

The more fragile something is, the more we should cherish it!

Even a killer like her understands this truth, but the young girl Bianca not only does not cherish it, but takes pride in sacrificing it...

Perhaps he was moved by the girl's selfless spirit, or perhaps Grigio was kind by nature from beginning to end.

The kindness that had always been hidden in her finally made her determined to find a way to destroy Nero before the girl was sacrificed.

But in the end, after some twists and turns, the three siblings finally found out that Nero had only one fatal weakness.

At the moment of sacrifice, Nero's fatal weakness will be exposed.

Grigio struggles to save Bianca.

This means that the girl will be in great danger.

But after Rossoblu's guidance, the three of them decided to use Bianca as bait to expose Nero's weakness, and then attack decisively, so that they could successfully rescue Bianca.

With the comfort of her two brothers, Grigio regained her fighting spirit.

But when it came to the final battle, an accident happened.

Nero appeared and took out a ball of light from the body of the previous sacrifice.

As the ball of light left the body, the previous sacrifice died.

Nero slowly brought the ball of light closer to Bianca on the altar.

At this time, the three siblings also realized that Nero's fatal weakness was this ball of light.

It places its weakness in the victim, and in this way, it becomes completely without weakness.

Bianca gladly accepted the arrival of the light ball with a smile, and she always believed that her sacrifice was worth it.

Grigio came out from the darkness, and no matter how she tried to persuade Bianca, she remained indifferent.

In the end, Bianca hid the ball of light inside her body.

Nero, who had no weaknesses anymore, also discovered the three uninvited guests, Rob's three siblings, and immediately attacked them.

It has no weaknesses and the three siblings are simply not able to deal with it.

Seeing that the two brothers were about to die...

At the fork in the train tracks, on one side were her two brothers, and on the other was the girl she desperately wanted to save...

After a difficult decision, Grigio chose her brothers.

She pulled the trigger, killing Bianca who had swallowed the ball of light.

As a weakness, the ball of light hidden in Bianca's body also shattered, and Nero became extremely weak and was easily killed by the three siblings.

But after this incident, Grigio fell into a huge contradiction.

This is not the first time she has committed murder.

But it was his first time to save someone, and unfortunately he failed.

The reason why this mission was completed and their lives were saved was because of the sacrifice of the lives of others.

This incident has since become a demon in Grigio's heart.

Rossoblu was deeply impressed by this incident.

Grigio was depressed for a long time after that...

But they had no time to feel sad, because Baku Baba, who raised them, sold the information of the three siblings to their former enemy for profit.

The three siblings have been fleeing in the universe ever since, and during the escape, they experienced a different way of life. The three siblings then made tremendous changes, climbed to the top of warriors, gained glory, and became Ultra Warriors.