Travel through the parallel world and become Uzumaki Naruto.
He has no friends, and his playmates are all kinds of animals.
Get the mythical beast cultivator system. As long as you cultivate animals into mythical beasts, you can get feedback rewards.
A small snake can be cultivated into an ancient mythical beast – a green dragon!
A sparrow can be cultivated into an ancient mythical beast – a Suzaku!
A cat can be cultivated into an ancient mythical beast – a white tiger!
…
From then on,
Uzumaki Naruto embarked on the road of becoming stronger in loneliness.
Until the Fourth Ninja War.
Madara Uchiha, who had transformed into the Six Paths mode, was in the void. When he asked who wanted to dance, he was suddenly entangled by a giant snake and couldn’t move.
On the head of the giant snake, Uzumaki Naruto stood calmly.
Animal figures kept appearing around him!
this moment,
The entire ninja world was quiet!
Uchiha Madara: “Impossible, absolutely impossible, I can’t beat a snake!”
Sarutobi Hiruzen: “What the hell is this sheep? My legs feel weak when I look at it!”
When everyone was horrified, these animals revealed their divine beast forms one after another…
novelsknight.com
Confusing timeline and plot, protagonist with depression and social phobia, I’m out
Well written, despite the fact that the world settings hugely deviate from the original world setting. It’s too dark and depressing so don’t read it while being in a bad mood.
Dude must have been living on a farm in his previous life or was a pet shop owner given the amount of animal friends from his previous life that are showing up.