noun, の adjective
The original thing you make is the original work. It's always better to have the original, rather than a copy, I think.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Comic book movies often lose the flavor of the original work.
Have you read Shakespeare's original works?
This manga was made into a TV anime and drama series.