How Could It Be a Ghost Pill?!

This book is also known as: "Legend of Counterattack: The Traveler's Different Path to Ninja World"

As soon as the protagonist travels through time, he falls into the whirlpool of the Naruto world. Orochimaru, mysterious organizations, etc. come to cause trouble one after another. But our protagonist is not afraid. With a sentence "My fate is in my own hands, and the ninja world must listen to my advice", he directly fights back.