The 'amor en custodia' full story might vary depending on its context. It could be a fictional narrative where two characters fall in love while one or both are in some form of custody. For example, it could be a story set in a detention center where inmates form deep emotional bonds. Without more specific information, it's hard to detail the exact plot.
In many cases, visual novels are indeed rated by CERO. CERO provides a standardized rating system to determine the suitability of the content for different age groups based on various factors like violence, sexual content, and themes.
Since I'm not fully aware of this specific story, I can only guess that one key element might be the relationship between the characters in custody. Another could be the external forces that act upon their love, like the rules and restrictions of the custody environment.
I'm not entirely sure specifically what the 'cero essence anime story' is about as it's not a widely known common title. It could be a very niche or self - created anime concept.
In many anime stories, Cero Essence could be acquired through interactions with powerful characters or by uncovering hidden locations. Sometimes, it requires solving complex puzzles or fulfilling certain conditions related to the plot.
Since we know so little about the 'cero essence anime story', it's difficult to say who the main characters might be. However, in most anime, there are characters who are central to the plot because of their relation to the main concept. So in this case, if the 'cero essence' is important, there might be a character who discovers it, or perhaps a character who is born with it. There could also be antagonists who want to use the 'cero essence' for their own malicious purposes.
Amor Towles novels are often known for their elegant prose. His writing has a certain charm that draws readers in. For example, in 'A Gentleman in Moscow', the descriptions of the hotel and the protagonist's experiences are vivid and detailed.