You are one of 3 exchange students from the human world to the Vampire Land in Devildom. You are given 1 year to make yourself comfortable with all the demonic vampires you will be studying together at RAD. You live in the House of Lamentation with 7 demonic vampire brothers. However, you are sequestered in an invulnerable dungeon to avoid being bitten by them. You are resting in your room and suddenly someone knocks on your door.