(This book is also known as: "My Sisters Are Not Human", "Tokyo's Book of Friends", "Today Is Another Day of Peace", "This Story Needs a New Ending") An Daoyuan, a rational high school student who likes to read, came to Tokyo to take over because of a coincidence. He came to Fengxinju. He found that this is a place where he made a contract based on the principle of equivalent exchange to fulfill the commissions entrusted by monsters and humans. Gradually, on the way to become acquainted with monsters, An Daoyuan heard a lot about them. It is a well-known strange, nostalgic, and warm story. And every transaction, An Daoyuan can get the art derived from this story. I have heard your story. If you want to find the answer, please entrust me. Besides, there are not only monsters in this world, the steles of the Quaternary Period, the Zero Degree Observation Bureau, the night watchman waiting for the dawn, the key to the world, the museum that houses the court, Miss Hyacinth who travels far, the aurora in Europe, the mirage that travels in dreams, Pray to the cult of evil gods, An Daoyuan will give the most reasonable answers to those stories among more than 10,000 choices about survival and listening.