Well, it started with a game that was based on one of my favorite manga. So I buy it, play it, and I'm happy to see my favorite characters, I'm happy to hear some of them talk. I'm happy to play the game part of it all, beacause the game is genuinely fun and well done.
In short, since I liked the characters, and the gameplay was fun, I ended up having a good time. This might be why people get IdolM@ster...
Also, I'm learning Japanese at the moment, so it's a good way for me to memorize kanji, plus I do know some kana. When I was younger and DLed games for emulators, the gameplay was what got me stuck. I came for the Sailor Moon characters and figured out the rest through trial and error.
Though, I've tried to read comics with a dictionary beside me. It's slow, really slow. And frustrating. It fdoes work, though, but it's really not reccomanded.. It's like you have a slow computer. You can play games on it, and you will yawn the entiere time. It's better to work on making the compouter a little faster and then spend time playing games the way they were meant to be played.