Rei Manryu-dono, a second-year middle school student, is a JC (Junior High School Student). Despite being an incredibly beautiful and cute girl, she is shrouded in an indescribable veil of terror. Because of this relentless psychological pressure, Rei has had no friends since she was old enough to understand. Her only companion is an inheritance—a massive, palatial mansion capable of housing hundreds of people. Then one day, Rei discovers several strange maids have suddenly appeared in her home. Strange horns, strange tails, they call themselves—Dragon! Search for cards from another world to strengthen your deck! Gather the power of your companions' hearts to defeat all evil! Join hands with the Dragon Maids and explore the future together! Start duel!