It's been 6 years (yes, it's a time skip) since Gray arrived in this world. He has been regularly doing his ninja training and has come up with a lot of ninjutsu. He has become a 17-year-old (his new body, of course) and, like in his previous life, he has heavily built his body for agility and flexibility. Gray uses a light chest armour, a custom-made straight blade, and a scarf made up of the scale of the sea serpent that he fought a year ago. The scarf provides some benefits like keeping the user cool from heat, making the user immune to fire magic, and curing diseases or sickness. During the time skip period, he joined a guild and has gone on multiple adventures. He is currently an A-ranked adventurer and is well known for his weird magic, which he calls ninjutsu.
Gray is currently in guild, looking for a suitable quest. As he looks around, an old man approaches him. Gray looks at them with a hint of confusion. The old person also starts to look at the quest board.
"Are you the ninja that everybody is talking about?", the old man picks up the quest that Gray was eyeing.
The quest was about killing a minotaur that had been attacking the villagers recently after it somehow came out of the dungeon.
"Yes, that's me, and who are you anyway?" Gray kept on staring at the quest paper
The old man smiles, "Who I am is not important, but the people around the guild like to call me headmaster, and you seem to be interested in this quest paper that I have been holding."
"Well, I was planning to take that quest before you came and took it," Gray replied
"I will give you this quest, but I want to tag along with you. Don't worry, you can take all the rewards, and I won't do anything on this quest." The old man looks at Gray for a response
Gray raises an eyebrow, "What are you planning?"
The old man laughs lightly, "I just wanted to see your ninjutsu in action."
"Fine by me," Gray responded
After some time, we see them both walking in the forest.
The old man spoke, "Are you sure you don't need help in defeating a minotaur? "
"Don't worry, I can handle it on my own," Gray responded
The old man can't help but nod as they both kept on walking. After walking more, they found the footprint of the minotaur. They looked around more and saw a huge minotaur drinking from the river.
"That one is a full-grown adult. I will ask you again, do you really not need my help?" The old man says in a worried tone, looking at Gray
Gray covers his face with scarf and does some warm-up, "Don't worry, old man, this won't even be a challenge for a ninja like me."
The old man looks worried and lets out a sigh.
Gray, with his high-speed runs, towards the minotaur. The old man is surprised by the speed.
The minotaur looks behind him, but it is too late as Gray has already reached him and pulls out his blade.
"Fire ignition jutsu." The blade is suddenly engulfed in flames as Gary swings the blade at the minotaur.
Minotaur is caught off guard and tries to block with his left hand. The blade slashes the arm clean off.
Minotaur screams in pain and rage, then tries to attack Gray. Gray dodges all the attacks and slices the Minoatur's right leg off.
The old man is in shock and is amazed by Gray.
Minotaur starts to charge blindly with a one leg. Gray, back off, and decides to sheath his blade as he gestures a handsign.
"Fire breath jutsu." A big wave of fire is sent at the minotaur, who is roasted in a few seconds.
The old man can't help but clap for Gray, "You really amazed me young man. Just with few moves you killed a Minotaur. That's not an easy feat to do."
Gary takes out the cystle from Minotaur, "Thanks for the compliment, old man."
The old man smirks, "I am the headmaster of the velmora's magic academy and would like you to join the academy."
Gary, dumbfounded by the offer, looks at the old man with a hint of suspicion