I Picked Up a Demon, but It's Pretty Traditional

The bad news: “Gu En accidentally released a sealed demon.” The good news: “She’s a traditionalist demon.” “Heh heh heh...” “Human, make a deal with me. Pledge your loyalty to the great demon Hutaotaize Melu Maikeweier, and I will grant you unparalleled wealth!” “But in exchange, you will be alone forever. Your heart will never beat for anyone, and you will never fall in love again. For the rest of your life, you’ll be confined to a tiny, dark room with an evil black cat for company!” “Get ready... Wait, why are you laughing?” Beneath the quiet city, evil spirits multiply, strange entities run rampant, and the uncanny rises. In this terrifying world, a demon sheltered Gu En beneath her slender, delicate arms. [Note: This novel is also known as The Demon Has Descended Beside Me, You’re the One I Choose, Melu the Traditionalist Archdemon and Her Timid Caretaker Gu En]