Invincibility Begins with a Super Fairy Manny IBWASFM - Chapter 611 - : Chaos Among the Clans (Third Update)

There are times when all it takes is the right voice to help you realize the greatness within to conquer the painful evil without. Uzumaki Naruto's voice of promise turns out to be his... from the future.

After Reincarnating into Naruto World at the Warring State Era as an Uzumaki, Masahiko thought that he got a useless System. He lived for 48 years as a normal, below average Uzumaki Shinobi.

That changed when he finally knew how the system works the day of his 49th Birthday!

- Description from Novelupdates

The world had changed when the System arrived, alongside the Cataclysm that filled the world with monsters. The technology was gone, replaced by classes and skills that allowed the people to fight back. When Devon ended up as a Blacksmith, a class that didn’t grant Intelligence, he had to face the reality, that his old career that he loved - mathematical sociologist - was over. Instead, he had ended up as yet another discarded member of the production class, overshadowed by the existence of the System Shops to the point of total marginalization. But, what if all he needed was to reapply his scientific thinking to the System...

Ye Chen transmigrated to a fantasy world and realized that he had seven seniors in his clan, and all of them were of stunning beauty.