I'm not sure exactly when it started. You might want to check on some dedicated literature forums or the author's official website for accurate information.
It depends on your reading habits. For those new to light novels in general, the pacing and some of the cultural references in Re: Monster might take some getting used to. But compared to some other more complex literary works, it's not that difficult. The story is engaging and draws you in, which can make up for any initial difficulties in reading.
Typically, in're monster fanfiction', there is a strong focus on the monsters. They can be depicted in various ways, either as fearsome or friendly. There's often a unique world - building aspect around the existence of these monsters.
There are also some dedicated light novel reading websites. However, make sure they are legal and authorized. For example, J - Novel Club might be a place to look for it, but always respect the copyrights when accessing such content.
To get the Re:Monster light novel, try searching on sites like eBay or AbeBooks. You might also come across it in specialty bookstores that focus on fantasy or manga-related materials.
It's not ethical. Such fanfiction might contain adult themes like excessive violence, sexual content or other disturbing elements. We should focus on positive and family - friendly forms of literature.