There would be the vampire protagonist, who is often brooding and mysterious. They have to hide their true nature from the other students. Then there's the human love interest, usually kind - hearted and perhaps a bit naive. There could also be a vampire hunter character who adds tension to the story, or a vampire rival who is jealous of the main vampire's relationship with the human.
One plot twist could be that the vampire is actually a half - vampire half - human hybrid and doesn't know about their true nature until they fall in love with a human at high school. The discovery of their identity could be a major turning point in the story.
She could use magic. For instance, she might use a spell to make her tail disappear and look like a normal human. Also, she would need to be careful not to get wet in public, because if she does, her mermaid form might be revealed.
Well, first, create some interesting vampire characters with their own personalities. For example, a brooding vampire who's trying to fit in at high school but is constantly tempted by blood. Then, set the high school scene. It could be a regular high school where vampires are secretly attending. Add some conflicts like the vampires having to hide their true nature from humans, or a love triangle between a human, a vampire, and a werewolf (to make it more exciting).
Perhaps it starts with a strange book in the school library. A curious student finds an old, dusty book that tells the story of vampires. As they read it, they unknowingly summon a vampire into the high school world. This vampire then starts to interact with the students, causing all sorts of chaos and mystery in the hallways and classrooms.
You might encounter a vampire in High School Story through special events or quests. Sometimes, completing certain tasks or achieving specific goals could lead to their appearance.
Well, getting a vampire in High School Story could involve solving puzzles or uncovering secrets. Maybe there's a particular club or activity that attracts them. You'll have to be observant and adventurous to find out.
I think you might have a chance if you join some secret clubs or attend strange parties that are rumored to have vampire connections. But be careful, it could be dangerous!
You might consider having a new student arrive at the high school who is secretly a vampire. Or perhaps there's an ancient relic on school grounds that awakens vampire powers in someone.