That sounds great! I'd love to get there - the idea of replacing most of my English language reading-for-enjoyment with Japanese is so appealing.
But for now I'm still in graded readers mostly. While they are fun, they're maybe not stuff I'd be excited about reading without the language learning aspect.
In Spanish I did go through a short horror story collection for grade school kids. Really hit the sweet spot of interesting, challenging, and intelligible. When that happens it's so satisfying.