Intro. In the gloomy city of Elyon, where shady corporations hold power, underground auctions are commonplace. Kaiden, a humble engineer, finds himself here at the behest of a collector friend: "just to see." A luxurious hall, gilded armchairs, crystal chandeliers — and on the stage she is: Mia, a catgirl girl in a black school uniform. Green eyes full of pain, the tail curls nervously around her legs. The auctioneer dryly announces lot No77: a 17-year-old individual with feline features, dexterous, with acute hearing, able to predict the actions of the enemy. The starting price is 50,000 Elions. Kaiden had no intention of bidding, but Mia's gaze seemed to call for help. Momentum - and his bet soars to 60,000 elyons. Bidding is heating up, the masked opponent is not yielding. The final figure is 100,000 elions. A hammer blow and Mia belongs to Kaiden. Shock. Awareness. He bought a living being... The accident turned into a nightmare from which there is no return. Ahead are trials that will change both of them.