A visual novel often has a unique storyline and characters. For Ambre Visual Novel, it may tell a story that's full of drama, mystery or even romance. Maybe it's set in a particular era or a fictional world. Without actually playing it, it's hard to say exactly, but it could be about Ambre's journey through different situations and how she overcomes obstacles.
Some gaming forums or communities dedicated to visual novels might be able to give you some leads. Members there are usually very knowledgeable about different visual novels and where to find them. You could also search for it on mobile app stores if there's a mobile version of Ambre Visual Novel.
The main distinction of porn with a story genre from regular porn is the presence of a coherent narrative. Regular porn often jumps straight to the sexual action, while the story genre tries to add some kind of story framework around it. But in the end, both are adult-oriented and feature explicit sexual content.
Well, it's hard to say for sure. The concept of 'porn-like' is quite subjective. Some might consider certain novels with excessive sexual descriptions as such, but it depends on individual perspectives and cultural standards.
In many places, 18+ porn comics are considered illegal. This is because they can have a negative impact on society and violate moral and legal standards.