Kidnapped to the Ninja World to Cultivate Immortality

What happens when someone is forcibly dragged by a System into an unfamiliar world to cultivate immortality?

Will they lie low until they become an immortal, or fight their way to immortality?

Or perhaps immortality doesn't even exist in this world?

This is the story of an internet-addicted teenager who encounters a downright awful System.

Wait, first, take this: Cloud Dragon Strike!!