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Detective Katayama Yoshitaro adopted a stray cat, and with the help of the cat detective, he successfully solved various mysteries. This book is the first in the series. It tells the story of the dean of the literature department of a women's university who requested the police to intervene in an investigation of corruption in the school. Detective Katayama was ordered to go, but he found the dean murdered in the campus cafe converted from a container...

Interpol Katayama and his sister visited his colleague Ishijin's new home in the suburbs. On the way, they met an old man who lived alone in the "Cat Mansion", a bungalow in the suburbs, who refused to be demolished. Soon, the owner of the "Cat Mansion" and her eleven cats were all killed overnight. Katayama and Ishizu started investigating the case, but they neglected to protect their sister Harumi, who joined the investigation out of curiosity and acted alone. She fell into a trap and her life was in danger...

Detective Katayama's sister Harumi received a young woman who wanted to sign up for all courses at the cultural and educational center where she worked. The name she left behind was Kanazaki Sawako. However, the woman with the same name passed away two years ago. With the arrival of this new student, all the teachers in the cultural and educational center fell into panic...

My name is Toshie Ohta, and I work in the same company as Yukiko Sada. We both came to work in this company at the same time, and our desks were right next to each other. In seven years, we have never been transferred. Because we look similar, colleagues say we are like twin sisters. It just so happens that we are both 29-year-old single girls. Colleagues who are fond of joking often say: "You want to get married at the same time, right? Why haven't you disclosed your relationship?" Whenever we hear such questioning jokes, we have an unspeakable annoyance in our hearts, so we have to laugh it off. Before getting off work on Friday, I said to Yukiko: "Let's spend the weekend." "How to spend the weekend?" "The mechanical work, the same thing every day, is really boring.

The cat detective series has been popular in Japan for 40 years since its first work was published in 1978. It pioneered Japanese youth humorous reasoning and created a world full of warmth and humanity. The 2012 Japanese drama adaptation starred Arashi member Masaki Aiba and was co-starred by Naoto Fujiki, which once again became a hot topic. The author writes a general preface especially for Chinese readers. This set includes: "Mountain Bike", "Opera House", "Fake House", "Chivalry", "Drama Club", "The Heir", "Rhapsody", "Cat Mansion", "Tracking" and "Mystery", a total of 10 volumes.

The Metropolitan Police Department's Investigation Section 1 was surrounded by a sense of calm joy. Especially for these two people, these days with nothing to do are simply days worthy of blessing. These two people are Section Chief Hakozaki and 25-year-old Detective Inoue. "Hey, Inoue." Section Chief Hakozaki called. "Yes, section chief." "How's it going with you and that cute girl?" "Yeah, uh-huh." Inoue blushed. "I can be your witness at any time." Hakozaki was in a particularly good mood today. "Let me know if necessary." "Thank you, section chief, for taking care of me." "You are usually too busy." Hakozaki said sincerely. "Section Chief." Inoue said solemnly.

Interpol Katayama was entrusted by his boss to accompany a man to a German castle to attend a family meeting held by his relatives. Along with him were the man's wife and children, as well as his mysterious illegitimate daughter. The castle is far away from the city and isolated from the world. The lonely father's attitude towards his children is also very cold. Katayama unexpectedly discovered that everyone in this wealthy family hated each other. In order to fight for his father's inheritance, he did not hesitate to put each other in extreme danger...

This is what vacation should be like. There was a scorching sun above my head, the intoxicating sound of the waves was listening to my ears, I was breathing in the fresh air full of the smell of sea water, and I was accompanied by a brown-skinned girl wearing a bikini. I never thought I would be lucky enough to take a break like this, but it turned out to be a reality. It was the first time since I arrived at the police station to enjoy a one-week vacation in the summer. I was also the first lucky person in this department, especially since I was promoted to the first team leader. In the summer of several years, several major cases occurred in succession, even on Sundays. A few years have passed, and once I was given a vacation, I didn't know how to spend it.

The high-profile Stavitz Violin Competition is about to enter the finals, but Mary, the favorite contestant, almost got scratched on her arm during morning practice. Immediately afterwards, all finalists must move into a closed training area and practice the designated new songs in the final stage independently without anyone's guidance. In order to protect the players, Detective Katayama also stayed at the training ground in plain clothes to prevent possible dangerous accidents...

Detective Katayama and his sister were on vacation in Switzerland. On the Jungfrau mountaineering tram, a bizarre case suddenly occurred. At the same time, the chief of the Tokyo Police Department urgently ordered Katayama to closely monitor the group of people traveling on the same mountain bike on Jungfraujoch, because these people are related to the mysterious disappearance of Yuichiro Mizuten, the owner of the Setagaya mansion in Tokyo...

The "Weird Club", a campus club of a middle school in Tokyo, is an exclusive club for boys. However, at the beginning of the new semester, the leader of the club proposed to admit a girl to join. This is a transfer student with a good appearance. The other male members in the club have a good impression of her and agree to her joining. However, one boy strongly opposes because he suspects that the girl's motives for joining the club are not pure, but have ulterior motives...