"Grandfather, I'm back! Look what I've found! It's going to be a great dinner!" The boy shouted happily, while he waved his arms to catch the old man's gaze. The child had jet black hair that stuck out from his head on all sides; that wasn't the most remarkable thing about him, though. Its greatest peculiarity was its long, brown haired tail. It was just as amazing that he was just dragging nothing less than a full-grown wolf!
"Bravo, Goku! That was very good!", The man laughed while stroking the boy's head. The man's name was Gohan.
Goku brought his booty to their little hut, a very poor and simple house, but they didn't need any more. In this dense and wild forest it was the only sign of human civilization within a radius of several hundred kilometers.
The boy came back immediately and stood in front of his grandfather.
"Grandfather, it's time for the exercise!"
"I understand ... wait for me ... you can warm up in the meantime!"
"Good ...", Goku answered politely and ran to a small meadow next to the hut while Gohan chopped the last piece of wood. Despite his age, he was still in such good shape that even a young athlete could get jealous. Soon afterwards he joined his grandson's warm-up exercises; at the end of this, the two did some kata to prepare for the real training. Exactly, they practiced martial arts.
"Goku! Concentrate more! You are much too restless! Look, so ... take it easy ...", Goku was corrected again and again. With difficulty he repeated the kata with the prescribed calm, but after a few minutes he fell back into his usual impatient manner. "Goku! Focus! In a fight, focus is everything!"
After the kata, the part that was interesting for the boy began: free fight. While the old master took a special fighting position, Goku waited for the first attack with an open pose.How often had Gohan preached to him that he should please change that, but he had never let himself be changed.
"Good! Then come on, Goku!"
"Here we go, grandfather!"
Goku jumped over five meters and attacked with a flying kick, but Gohan fought him off with one forearm and grabbed his leg, then knocked the boy to the ground.
"What was that ?! Come on, again! You can do it much better!", The man laughed at Goku's snapped expression.
"I'm coming! Yahaaa !!!"
Again he leapt towards the enemy, this time with a hail of punches. Despite the speed, Gohan fended off everyone and countered with a strong punch that hit the boy in the face.
"Ouch !!! Ouch ... shit ... well wait ...!", Goku scolded and tensed his right arm. "Scissors ... paper ... stone !!!"
With all his strength he jumped at Gohan, who in view of his fist limited himself to avoiding the attack, so that Goku made a flight of several meters carried by his own momentum and finally fell to the ground.
"But why ??? Uff, why does it never work ???", the little fighter growled while he got up again.
"Ahahaha! Look ... you always have to look your opponent in the eye ... your fist is very powerful, but slow and predictable. But you were good anyway. Come on, try again!", The Master explained smiling and with great calm. He knew too well about his grandson's lack of patience, which was almost greater than his extraordinary talent for martial arts.
An almost extraterrestrial talent. Goku was about nine years old, but his strength was already many times greater than that of an adult. Gohan thought for a moment of that day eight and a half years ago when he found Goku in the middle of the forest. He was alone - you could say "fallen from heaven". He had found it in a strange metal ball, which was in the middle of a smoking crater that was over five meters deep.How many times had he wondered where this child was from ... Heaven?
"Grandfather, I'm coming!" Warned the boy, this sentence brought the man back to the present.
"Good! Make an effort!"

The workout continued until sunset when it was time for dinner. The two ate the roasted wolf, for them such food was not so strange.
"Goku ... today it's full moon again ... you know what that means?", Gohan suddenly wanted to know, his expression was suddenly very serious.
Goku lifted his eyes from the plate and nodded. "Yes, the monster of the full moon is coming tonight! I have to stay inside and not go outside! I understand!"
"Good. Good.", Gohan breathed a sigh of relief and found his usual calm and knowing smile again. He issued this warning every evening before the full moon. He remembered with great horror the last time the "monster of the full moon" had come. He had only been able to stop it with the greatest effort, a large scar on his back remained as an eternal warning. But he had never been able to remove the danger itself. He watched his grandson with great concern as he devoured his third plate with his usual appetite.
"Good. Now wash your face and teeth, then off to bed! Tomorrow I'll show you a very interesting thing!"
"It's fine, grandfather!"

As always, Goku followed his grandfather's advice and went straight to bed, Gohan carefully closed all windows so that not even the smallest ray of light could fall into the small room. He too lay down in his bed and watched his grandson with concern, he waited silently until he was sound asleep. After ten minutes, the deep and steady breath testified that Goku was in the land of dreams.
"Good ..." thought Gohan. "Now that he's asleep, even an earthquake can't wake him up. It all looks like everything will go well this time too ..."Although he tried to stay awake, after two hours his songs became heavy as lead and he too fell asleep.

This peaceful sleep lasted only a few hours, unusual for the Son house. Goku became restless, apparently dreaming of something very unpleasant.
"No ... no ... it ... explodes ... the moon ... no, go away! Monster ...! Don't!" He moaned in his sleep, then suddenly woke up. He was breathless and drenched in sweat, it took a few seconds before he understood when and where he was. He hadn't woken Grandfather Gohan.
He slowly turned around in bed, but he couldn't get back to sleep. He could turn and turn as he pleased, in vain. To make matters worse, fate would have it that his gaze fell on one of the four windows through which a thin beam of light fell. Strangely enough, this beam aroused his curiosity to the point that Goku stood up and peeked outside to see where it might be coming from. Since he couldn't see anything, he scurried quickly to the door and looked outside.
The creaking of the door rudely pulled Gohan out of his dreams, immediately he looked at Goku's bed, with great horror he realized that it was empty.
"Goku! I told you not to go outside!" He yelled while looking for his grandson. In the doorway he saw his monkey tail. "Goku! Come back! The monster is coming!" But the boy didn't seem to hear him. Gohan jumped forward and wanted to pull Goku inside, but Goku was faster and ran outside. Now the man's blood was foaming with adrenaline, he was so afraid now.
"Grandpa ... why is it so light even when it is night?" he heard Goku's voice far away.
"Goku !!! I order you to come back immediately !!! Can you hear me ???", Gohan shouted, almost in a panic.
He ran after the boy, who was in the shade of a tree, the full moon shining high in the sky above them. One step further and Goku stepped out of the shadows and was illuminated by the light of the full moon."Ohhh! How beautiful ... the full moon! I've never seen him like this ..." Gohan threw himself in front of Goku and covered him with his coat. "Hey, what are you doing there, grandfather ???"
"Nothing ... I'll protect you from the monster! Come on, we're going back ...", Gohan explained nervously and tried to push him towards the hut with certainty, but suddenly the child's body stiffened. "Goku! Come on! Please !!!"
But it was too late, he couldn't hear him anymore. As if hypnotized, he stared at this glowing ball in the sky, his eyes had taken on the color of blood, the beating of his heart seemed like the beating of a drum. Before Grandfather Gohan could intervene, this strange metamorphosis had already begun. The boy's body puffed up and tore his clothes, his face twisted more and more into a monster-like grimace. Even more: Goku grew tall and his whole body was covered with thick fur. Gohan had to watch this scene fearfully and powerlessly, now his grandson was more than ten meters tall. He had become a terrible and incredibly aggressive armed monkey. The monster of the full moon.

"Goku !!! My God, calm down !!! It's me, your grandfather, Gohan !!! I beg you !!!" he shouted as loudly as possible, but Goku didn't hear him. His roar made the whole jungle tremble, all its inhabitants were awakened by it and began to flee in fear. A punch uprooted a dozen hundred-year-old trees, his kick crumbled a rock weighing tons. Gohan had to jump fifteen meters to avoid being hit by the stones and branches flying around; he had to split a rock with his fist. But he wasn't attentive enough, in a moment of distraction he was hit by the monster's tail and thrown to the ground. Despite a gaping wound on his forehead, he got up immediately and returned to the monster's field of vision."Goku! Stop it! Please! Calm down!"
In response to this, Goku hurled a rock at him that he had just picked up, but didn't hit his grandfather by the width of a hair. With great horror he realized that Goku's strength had multiplied, now he was too powerful an opponent for him. Now there was only one way out ...
"Goku ... please forgive me ..." I do that for your well-being too ... "
He was waiting for a quiet moment in this inferno, in his anger Goku rolled over the whole forest, the nearby mountains and also his hut. Gohan stood on a rock and concentrated his strength to the maximum, his muscles increased noticeably.
"Please forgive me ...", he whispered, then shouted all the louder: "Ka ... Me ... Ha ... Me ..."
A glowing ball of