It's not a proper way to learn any language, trust me, and the price is laughable. Rosetta Stone uses a method which was nothing but a fad based on incorrect assumptions about the way people learn. It's a confusing and frustrating waste of time. It might be okayish for Klingon, though.
Living Language uses actual workbooks, supplemented with Audio CDs, and is 1/10 the price. You'll learn enough from them to start reading and listening to simpler material, and using vocabulary builders. They're also easy to refer to later.
Human Japanese is something you should definitely look into for learning Japanese. Tells you a lot about the culture too, and is written in a nice, friendly and conversational style.
Or, you know, just use the best free alternative on the internet.
Looks like he even added videos now. It's the best complementary lecture to learning vocabulary.
All those paid courses are made to prepare people to actualy speak japanese and converse with japanese people. For OP's purposes this is hindering more than helping. If it is only reading comprehension, simple grammar and vocabulary is all he needs. While the latter is absolutely key.
In case you missed my post, it's just on the previous page.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.