Okitegami Kyouko is a famous detective who solves cases in a single day. In fact, she has to, since her memories only last for one day before they ‘reset. However, for important things, she writes messages for herself down on her body with a special pen.

Yuichiros dream is near-impossible, given that vampires are seven times stronger than humans, and the only way to kill them is by mastering Cursed Gear, advanced demon-possessed weaponry. Not to mention that humanitys most elite Vampire Extermination Unit