Today's Reasoning~

Du Lingying, a seemingly ordinary female high school student, has dreamed of becoming a "famous detective" since she was a child. However, when she just entered the high school campus and was about to borrow a mystery novel from the library, a piercing scream turned the fantasy into a cold reality... In the weeds outside the window, there was a boy's body lying suddenly - ah, no, it was a dying boy who almost became a corpse. But regardless of whether he was dead or not, the suspected students were caught in the school conference room and forced to face the strict investigation by the director of moral education. It's a pity that this teacher may be suitable as a moral education director, but he seems a bit rigid as a judge... Du Lingying's classmate Ai Yiqian: "Because... (Analysis), so... (Analysis), and then... (Analysis)." Director of Moral Education: "(nods) Okay, what you said makes sense. Then according to your analysis, the number one suspect is you." Ai Yiqian: "?" Tan Shen, who was also captured in the conference room: "From the surveillance... (Analysis), the time of the crime... (Analysis), so he can basically be ruled out as a suspect." Director of Moral Education: "(nods again) Okay, what you said makes sense. So now the number one suspect becomes you." Tan Shen: "..." Fortunately, there are two lucky things - First, it's a good thing that the director of moral education didn't turn out to be an ancient judge. Otherwise, the skyrocketing death toll would have included executioners who died of exhaustion. Secondly, fortunately, Du Lingying's brain has been well nurtured by mystery novels. No innocent person was harmed in this mystery... Probably. All in all, after this unexpected case, the two met Tan Shen, who was at the same level, joined the reasoning club, and established a "watching chess and talking" detective team. A classmate: "Who came up with the name of your detective team? Isn't it too middle-school? My teacher laughed to death when he saw it." Du Lingying: "It's your teacher." A classmate: "... Just pretend I didn't say anything." From then on, the reasoning routine of the three people slowly unfolded—— The sworn PE teacher said: "I saw my best friend appear in two places at the same time. Did she travel through time?" The frontman of the campus band with a sad face said: "Our band's instrument was smashed - look clearly! It's not a guitar! It's a bass!" A ghostly girl who is keen on supernatural events: "Look! These are the supernatural photos taken by our seniors ten years ago! Let's learn from our seniors and hold a spirit summoning ceremony~" … As various strange commissions come one after another, the three of them have a deeper understanding of each other. However, just when the relationship between them could be called "friends", Du Lingying vaguely noticed that there seemed to be some unpleasant secrets hidden under the surface cheerfulness... But so what? Anyway, Du Lingying herself didn't have much fun in the past. It's better to cherish the good things now and live with it. ... Just don't lose friends again. The heroine who looks naive on the outside and has a profound heart + the reliable cold-faced complaining male protagonist A + the casual and casual mysterious male protagonist B (None of the three have CP orientation, and the main force of reasoning is usually the female protagonist) p. S.: Don't think of the heroine too innocently, she is not as lively and cheerful as she looks. Purpose: Growth and friendship of high school students