In Akabane Nights, you play as a vampire searching a small part of Tokyo for blood to drink. Depending on hunger and time, you will be able to attack different people as they move areund the city.
Akabane Nights has a small world to explore, and not many people to talk to or target, but these are well done. At dawn, you get a list of other things to try, and once those are done, the exploration is mostly complete.
Owerall, it's a fun game.