In the garbage dump of the royal capital Mistoria, debt-ridden poor adventurer Leon picks up an old grimoire. The moment he opens it, Lilia, the spirit of the legendary Seven Great Grimoires 'Black Apocalypse', appears. But despite her cute, small appearance, she's an ultra-sadist! 'Since we've made a contract, you're my slave now. Your only replies are "Yes" or "I'll kill you"!' Bound by a contract of absolute obedience, Leon endures her unreasonable training every day. But thanks to that, he