Hentai High School+ ((better)) Instant

This series is incredibly dark and contains mature content, but it is widely considered one of the greatest manga of all time for its art and storytelling. How to Choose?

Dr. Kenzo Tenma, a talented brain surgeon, chooses to save a young boy's life over a powerful politician's. Years later, he discovers that the boy he saved has grown into a cold-blooded serial killer. hentai high school+