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The deceased at the scene of the crime was a serious game enthusiast. The note he was holding tightly in his hand only contained the words "Don't call me a loser." It was initially regarded as a meaningless last word. As the investigation deepened, the detective discovered that the deceased was always insulted by his teammates due to his poor gaming skills, and even had conflicts with others. This note actually contained the murderer's game ID abbreviation. Finally, he followed the game friend list and found the suspect who committed the murder due to team conflicts.

The protagonist is a rookie detective who is always confused. Every time he investigates a case, there are many situations. However, the orange cat he raised has its own "crime-solving radar" and can always find key clues in corners that he ignores - such as napping next to the weapon left behind by the murderer, or pushing a yarn ball stained with evidence to his feet. In the end, it is often the cat's "guidance" that solves the case, and the detective has to open cans for the cat to "thank" for the clues.