Lin Wan is a card storage specialist at the "Rare Object Management and Containment Center". Her daily job is to appease and contain out-of-control rare object cards. With a meager salary, she lives a life like ordinary workers worrying about attendance awards and bonuses. Once, she successfully calmed the out-of-control C-114 "Manic Shadow Demon" card, but she only received a reward of 200 yuan, which was not enough to repair the mobile phone screen that was cracked by the card. Just as she was complaining about her work, the center issued an emergency mission, and a high-risk card reaction that was not included in the East District appeared. In order to complete the task, earn higher rewards, and to protect the peace of the city, Lin Wan had to interrupt her daily "fishing" routine, join the field team, and start a journey to contain high-risk cards. Along the way, she will encounter various supernatural beings with different personalities and difficult and high-risk cards. She will also work with her colleagues to decipher the secrets behind the cards. Between "working to make money" and "guarding responsibility", she will write a unique daily life for the card containment specialist.