Definitely. The story of Hachi originated from a true event. It showcases the remarkable devotion and unwavering love a dog can have for its human companion.
One main feature is the presence of Vocaloid characters. For instance, in 'Hatsune Miku: Project Diva', Miku is the central character. Another feature is the music. Since Vocaloid is associated with music, many of these visual novels have music elements integrated into the story. For example, certain scenes might be accompanied by a Vocaloid song.
I'm not sure specifically what the 'hachi original story' is without more context. It could be about a character named Hachi. Maybe it's a story about Hachi's adventure, or his relationship with other characters in a particular fictional world.