Begin by exploring the world of Kindergarten 2. Take note of the different areas, the types of activities that happen there, and the relationships between the characters. You can start your fanfic with a description of the kindergarten setting, for instance, 'The Kindergarten was filled with bright colors and the sound of children laughing. But today, something strange was about to happen...' This sets the mood and gives the reader an idea of the environment your story will take place in. You can also look at other fanfics for inspiration, but make sure to add your own unique twist.
First, think about the characters you want to focus on. It could be the main character from the game or create your own new character. Then, come up with a simple plot like a quest or a problem that needs to be solved. For example, if your character is missing their favorite toy, they go on a search around the kindergarten to find it.
To start a Kindergarten 2 The Game fanfic, decide on the genre of your story. Will it be a mystery, a comedy, or an adventure? Once you've chosen, think about the conflict. It could be a conflict between two characters, like two kids arguing over a game, or a bigger conflict like a strange occurrence in the kindergarten that disrupts the normal routine. Then, introduce your characters and start building the story from there. You might start with something like 'There was once a little girl named Lily in Kindergarten 2. She was always full of curiosity and one day, she noticed something odd in the corner of the playroom...'