Transmigrated into One Piece world with a Gift Pack - Power Level [Spoiler Alert]

[You have entered the dungeon at Gwachun Station’s 1st Exit.] When former high school student Kang Woojin finds himself returned back to Earth after being forcibly summoned to a foreign planet for 20 years, he soon finds that Earth is not the same, normal place as he once remembered it to be.

This is a story about a legend, of one that can never be forgotten.
Summer, first time down the mountains in 16 years, after being raised by his 3 masters and Fairy sister.

‘Why won’t you follow the Rules of society?’ The rules are the tool made by the strong, so I follow my own rules.

‘Why won’t you just use your brain instead of your brawn?’ Idiot! Have you ever seen anyone use their brain, to get back at an ant that bites them!? No, they just casually step on it.

‘Oh, everyone says you’re a first-class beauty huh?’ well, I’m sorry but even you are not qualified to be my wife. Only a ‘Summer class beauty’ is worthy enough!

‘My enemy is sick?’ Oh, don’t worry, even if you’re on your last breath and I feel it’s beneath me to slap shot you dead. I’ll just fix you up and then beat you!

‘Who am I?’

“I am Summer in the spring, the autumn, and the winter, I’m the world’s first above the heavens!”

Follow me, Summer Day as I step by step become known as the world’s first master, the world’s first doctor, the world’s richest man…… a lot of other world’s number one, but most importantly, The worlds happiest man.

- Description from Novelupdates

“No one is standing in the sky to begin with.”

“Whether it’s Hokage or the God of Ninja World.”

“But the window period for the Throne of Heaven has been too long.”

“From today, I will stand in the sky.”

Above Konoha, Naruto Uzumaki’s hairspray hand touched the drooping bangs, revealing sharp eyes.

Boiling blue light descended from the night, pulling Uzumaki Naruto away from the sky.

In Muye Village below, countless ninjas looked shocked and unbelievable.

Iruka: “Impossible, you are not that gentle Naruto, who are you?”

Kakashi: “The disciple I know is a gentle boy who will always take care of and protect others and inherit the will of fire.”

Uchiha Sasuke: “Naruto, you pulled me out of the abyss, but why do you want to leave now? Damn, even if you break your limbs, I, Uchiha Sasuke, will bring you back!”

PS:

A Naruto who was not influenced by Ashura Chakra, accepted Aizen’s teachings, was gentle and refined since he was a child, but was actually ambitious and deep-minded.

- Description from novelbuddy