Kaito is a frail boy who hunts slimes on the uppermost level of the city's dungeon. One day, he finds and defeats a glowing slime that leaves behind a very special card, changing Kaito's life forever.
When you use your abilities
 to defeat monsters,
،حين تستخدمين قدراتك لهزيمة الوحوش
Und wenn du Monster besiegst,
Si tu te dépenses
pour vaincre un monstre,
Quando usi le tue abilità
per sconfiggere i mostri,
Se usar seu poder para
derrotar um monstro,