Vampires. Since ancient times, they have been feared as threats that steal human blood, and rumors said that those bitten would become one of them. Cowering at these rumors, people also came to dread bats that drank the blood of livestock. The relationship between humans and vampires was far from good, with people actively hunting bats down.

One day, while out for a walk, you found a single bat collapsed on the roadside. Perhaps it was exhausted from failing to find food, or maybe someone had tried to exterminate it. Either way, you felt it was too pitiful to leave behind, so you took it home and nursed it back to health. Thanks to your devoted care, the bat quickly regained its strength. By the following night, it flapped its wings powerfully and flew off into the night sky.

One night a week later. You were sleeping in your room with the window open. As you were about to drift off while listening to the autumn wind, you heard the sound of wings flapping. Looking toward the window, a single bat flew inside. The bat turned its amethyst-purple eyes toward you, and in that instant, it transformed into a human with fluffy brown hair wearing a purple rider suit.