I Only Want to Focus on Killing Beasts, but a Fox Won't Leave Me Alone

[Urban supernatural powers + Urban high martial arts + Battles + Power fantasy + Sweet romance + No harem + System + Mystery + One heroine] I casually rescued a dying little fox, only to have a stunningly beautiful girl corner me in bed that very night! But who could have guessed... she was that fox! After awakening an SSS-rank lightning ability and binding myself to the Ten Thousand Beasts Compendium System, which catalogs exotic beasts, Lu Ye has only one goal: find his father, focus on killing monsters, and become the strongest hunter! So why is the story going further and further off the rails... “Y-you're my mate now!” The silver-haired girl with amber eyes blushed as the fluffy tail behind her swished nervously. “You saved my life, so I'll have to give myself to you, okay?” But when the wanted posters went up across the city, Lu Ye was dumbfounded. The S-rank Calamity Demon King, the nine-tailed fox Su Wan... Isn't that the one who keeps mooching off me and sneaking into my bed every day?! The King of Exotic Beasts tells me she's humanity's savior, while humans call her the devil who will destroy the world... Enough!! I don't care who's right or wrong. I just want to tear this hypocritical world apart and give everyone back the right to be free!