He transmigrates as Naruto's twin younger brother and starts out squatting at the village entrance, munching on rice balls.
Konoha's world has gone completely off the rails: Kage-level ninja fighting over barbecue, and tailed beasts acting as weather reporters.
He's constantly being used for target practice by Guy and his son with Thunder God Kunai, so hiding in tree branches has become part of daily life.
Then he unexpectedly gains a golden finger, and bestselling novels from Earth appear in his mind.
It can automatically generate masterpieces like Slay the Gods and Strange Tales, but only he can see them.
He copies the books to earn royalties and buy barbecue to stay alive. Even Iruka is willing to bow his head for the next update.
The whole village goes crazy waiting for new chapters. Kakashi stays up all night scouring the streets just to get his hands on the latest one.
The Akatsuki infiltrate the village just to ask about the plot, while Pain furiously tears up the streets to erase his embarrassing past.
He stirs up the shinobi world with his pen. Whenever he kills off a character, the whole cast protests; whenever he wrecks the lore, entire clans beg for mercy.
From dodging the Flying Thunder God to being mobbed by the Five Kage for new chapters, wherever his pen points, the whole world goes mad.
In the end, a single document brings peace, and he puts an end to the war among the three realms with his own pen.