QED (formal) :
something that you say in order to emphasize that a fact proves what you have just said is true (http://idioms.thefreedictionary.com/Quod+erat+demonstrandum) quod erat demonstrandum (KWAWD ER-aht dem-uhn-STRAN-duhm) A phrase used to signal that a proof has just been completed. From Latin, meaning “that which was to be demonstrated.” (http://www.bartleby.com/59/4/quoderatdemo.html)
Quod Erat Demonstrandum is the story about So Toma, a genius who graduated from MIT at the age of 15. He comes to Japan to experience the live of high school.That’s where he meet Kana Mizuhara, a daughter of police inspector who like to get her hands on other’s stuffs.Kana’s curiosity and Toma’s intelligence are the great combination to solve many cases.
Katou Motohiro sensei makes this manga quite fascinating. Most the cases are some things we can see everyday. It means, it’s not always about homicide. He he he