Hangyaku no Apsalar is a sequel to Maboroshi no Lorelei, but the gameplay and graphics style are completely different. While the first Dracula Detective game uses 3D pre-rendered graphics and plays as an interactive movie, this sequel uses 2D graphics, anime art, and one progresses by reading through the dialogues (of which not all are voice-acted) in a similar manner to visual novels.
The story takes place in the 23rd century where people can freely use time travel to go back to the past. But altering the past or smuggling long lost things back to the present can yield serious consequences, and for that purpose a special police task force has been created to enforce the law and protect the present timeline from criminals trying to alter or affect it in any way. The protagonist of the story is Raizou Narukami (鳴神 雷蔵), also known as Dracula Detective due to being a descendant of the legendary vampire Dracula from Transylvania. Those very genes give him certain special powers and help him in his task as a detective, no matter how difficult the cases that are waiting.