D would make a good introductory language if the documentation didn't expect familiarity with other languages. Despite its translation being incomplete, one such resource is the 'Programming in D' book for the novice programmer: Programming in D (translation of the Turkish D Programlama Dili Dersleri)
Other material that you find on D may use comparisons with other languages for teaching, and those that don't are covering higher level concepts which build on basic programming. But if you must try despite my warnings you should start with D: A Newbie-Oriented Tutorial.
If you are a D enthusiast and wish to improve on this current state there is a wikiBook with this goal in mind, A Beginner's Guide to D. It currently is pretty minimal and would leave new programmers hanging.