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In the parallel universe of the future, science and technology are highly developed. Not only humans, but also some animals have super intelligence, and thoughts can be spread to every corner of the world through electromagnetic waves. In this world full of opportunities and challenges, the protagonist Anan leads a double life: she is the housekeeper of a B&B on a green planet, and she is also a part-time private detective. Anan has a lazy personality, but has a good temper and upright views. He is an asexual. Her pet Dafu is a healthy but obese big cat, equally lazy but very smart, and is Anan's closest companion. One day, Anan received a mysterious gift: a pair of blue headphones and a letter. After putting on the headphones, she was surprised to find that she could hear other people's voices...