Yes, Mugen Kairou is definitely a ‘fun’ and challenging read in places. The main things that have made it difficult are: 1. Written entirely in 1st person 2. Very detailed descriptions 3. Deliberately vague and/or philosophical passages 4. Very large vocabulary and a kanji-rapefest in places (although there have only been a few that I haven’t encountered before). Granted, the ??? (the term used for the ‘training/breaking’ sections in the game) segments are mostly very straightforward, but for me, they aren’t really what the game’s about. On the whole though, it’s probably an easier read than G-Senjou no Maou. I can see why people might hate this game and consider it as inferior to everything else Black Cyc had done, but that’s a topic for a different time + thread.
Like Lancer-X, my only real source of Japanese education has been via VNs. As a result, I’ve focused exclusively on learning how to read Japanese, and so I started by learning how to recognise/write around 2050 kanji with a rough idea of what each meant (but I didn’t learn any readings at this stage) before I learnt any vocabulary (I did pick up some words along the way of course) or grammar. After that, I started learning vocabulary etc. in the context of sentences and whilst continuing to increase the number of kanji I can recognise. I started playing G-Senjou no Maou after I’d been learning for around 10 months or so. It certainly wasn’t an easy read and although there were a few passages that I wasn’t able to understand at all, I was able to finish and enjoy it (there were a lot of words that I didn’t bother looking up whilst playing though, as their meaning was either clear from the kanji they were formed from, or from the context of the story). This learning method might not work for everyone, as I don’t have any reason to speak or write Japanese at the moment, so at this stage, I’m just focusing on what I want to learn.
Anyway, this thread has kind of gone off topic.