I'm not entirely sure specifically about 'nagisa no visual novel' without more context. It could potentially be a visual novel centered around a character named Nagisa. Visual novels often have storylines involving relationships, personal growth, and various adventures.
In the 'Assassination Classroom' series, Nagisa is male. In fanfics, while some might play with the concept in creative ways like gender - bender scenarios for the sake of unique storylines, traditionally Nagisa is a male character.
I'm not sure where you can specifically find 'nagisa no visual novel'. You could try searching on well - known digital game platforms like Steam or GOG. Sometimes, visual novels are also available on the official websites of the developers or publishers.
There's a fanfic called 'Nagisa's Assassin's Creed'. It shows Nagisa in a world of assassins, where she has to navigate through various challenges and prove herself. The story has a lot of action scenes that highlight her badassery.
One good story could be 'Shizuma and Nagisa's Unspoken Bond'. It beautifully explores their relationship in a heartwarming way. It shows how they support each other through different challenges.
One common theme is jealousy. Since Karma is possessive, there's often a lot of jealousy when others get too close to Nagisa. Another theme is protection. Karma sees himself as Nagisa's protector, which ties into his possessiveness.