A 'perfect' sex novel, in my opinion, has well - developed characters. For example, if the characters are complex and multi - dimensional, it makes their sexual experiences more relatable and engaging.
One way is through emotional connection. For example, the characters could have deep conversations and shared experiences that build a strong bond. In a light novel, this could be shown through their dialogue and the way they support each other during difficult times. This emotional closeness can be a part of what makes a relationship 'perfect' without getting into inappropriate details.
Another one could be 'Kaguya - sama: Love is War'. It's about two intelligent students who are in love but are too prideful to admit it first. The story is filled with their comical attempts at getting the other to confess, which showcases a unique kind of relationship that is about mutual understanding and respect, elements that can be part of a great relationship as might be hinted in the idea of 'perfect sex' in a more general sense of perfect relationship.
A 'perfect half light novel' might be a light novel that is divided into two distinct parts, and one part is considered perfect in some sense. For example, the first half could have a really engaging story with well - developed characters and an exciting plot, while the second half might be less so. It could also mean that it has achieved half of what makes a light novel 'perfect', like having great world - building but lacking in emotional depth.
Since I don't know the exact 'perfect feast light novel', it could potentially be about a group of characters who come together for a perfect feast. This feast might be the culmination of a long journey they've been on, where they share stories, form new alliances, and experience new types of food or magical cuisines in a fantastical setting. Maybe there are challenges they had to overcome to reach this feast, like battling monsters or solving puzzles.
It might be about a protagonist who discovers that the so - called perfect world has its own hidden flaws. Maybe there are secrets or power struggles beneath the surface of this idyllic setting. The story could revolve around the character's attempts to either maintain the illusion of perfection or expose and fix the underlying problems.
It's mainly about a young man's journey in a fantastical world filled with various challenges, powerful beings, and unique cultivation systems. He has to grow stronger, face numerous enemies, and uncover the secrets of the world he lives in.
I'm not sure specifically as there could be many light novels with this title. It might be about a perfect romantic match, or perhaps a perfect match in some other context like a perfect match of skills in a game or a perfect match between characters in an adventure.