When he was in Konoha, he started out as Tsunade's childhood sweetheart. This start required him to change his fate.

The tragedies of World War II and World War III, and the decline of Konoha, all disappeared.

I want to hold Tsunade's hand and walk step by step to the top of the ninja world.

Uchiha Madara, Otsutsuki Kaguya, come if you can!

A sports idiot travels to the world of Prince of Tennis.

Poor talent?

It doesn't matter, the double return system allows you to show off, directly bind to the protagonist, and double the return strength.

"If everything can be bound, why can't we bind Nanjiro?"

[Nanjiro is the boss, no less than the son of luck. ]

"Ryoma, you're nine years old and haven't even started the Thousand Hammers Training yet. I'm deeply worried."

Many years later, after leaving the professional arena, Delongma wrote a book titled "The Story of My Brother Pushing Me to Achieve Growth"

Mu Yue traveled to the world of Naruto and became an ordinary chuunin teacher at Konoha Ninja School and a member of the Root Organization.

Fortunately, after awakening the teacher system, you can become stronger by teaching.

In order not to become Danzo's consumables, Mu Yue worked hard to teach and increase her strength.

"Complete the teaching rated A for the first time and receive the reward - mastery of fire attribute chakra properties change."

"Under your guidance, this disciple has worked hard to practice, and his overall strength has been greatly improved, and he has been rewarded - the Immortal Human Body!"

From then on, there was a teacher in the ninja world who only wanted to make his students strong.

Shisui was not blinded by Danzo, and he successfully prevented Uchiha from annihilation.

When Metkai met the Seven Ninja Swordsmen, he no longer watched helplessly as Metkai opened the door to death and fought hard.

Obito defeated Uchiha Madara's conspiracy and did not turn into a psychopath. He was still the enthusiastic young man who was eager to help others and wanted to become Hokage.

(ps: There is a high-quality old book on Naruto with 21.78 million words, quality guaranteed)

(There is no female protagonist in this article!)

Takahashi Hikoichi travels to the world of Prince of Tennis, joins Rikkai University at the beginning, awakens the idle system, and becomes stronger just by lying down.

"After a day of idle time, my tennis skills have become roughly proficient and I am now at the regional level."

"After a week of playing, my tennis skills have been perfected and I have reached the Kanto level."

"After a month of playing, my tennis skills have reached perfection and I am now a national-level player."

……

"After a year of playing, my tennis skills have reached the pinnacle. I have realized the unity of man and nature, created my own magic skills, and have world-class strength."

While others are training, he lies down!

I thought he was just a loser, but I didn't expect his strength to increase instead of decrease.

Everyone was shocked!

He became a legend at Rikkai University and reached the pinnacle of the tennis world...