On Halloween of 1979, a newborn baby was abandoned at a hospital in Europe, his origins entirely unknown. Non-communicative and prone to fits of crying, L spent his early life in orphanages with normal children and nurses who did not understand him. At the age of eight he was discovered by the great inventor Quillish Wammy and transferred to Wammy's House, an orphanage for gifted children in Winchester, England. He thrived in this environment as a child prodigy, devouring information that was taught to him and displaying an incredible amount of analytical genius. Solving crime became a favorite pastime and when he reached adolescence he was already assisting local law enforcement. He was a world-renowned detective by the time he turned fifteen.
As a young adult, L traveled the world solving great mysteries that no one else could unravel. He was always accompanied by Quillish Wammy, who assumed the alias Watari and served as an intermediary for the secretive L, who never showed his face to anyone. These precautions proved to be wise when a mass murderer known as Kira appeared in the world. Kira seemed to have the ability to kill simply by knowing the name and face of his victim, causing heart attacks in criminals around the world. This mystifying case intrigued L and drove him to turn his entire focus on Kira.
The Kira investigation very quickly lead L to Japan, where he pinpointed the killer's location to be centered in the Kanto region. Allying himself with the National Police Agency's task force, L eventually came to suspect Light Yagami, the son of Chief Detective Soichiro Yagami. He went so far as to follow Light to college and revealed his identity as L in order to observe Light's reactions. When a second Kira appeared, L pointed the finger at Light's girlfriend, Misa Amane. When she was apprehended for questioning, Light asked to be confined as well, citing worries that he might be Kira and suffering from disassociative amnesia. For two weeks the killings stopped while the pair were in confinement, but when criminals suddenly began dying again L was forced to admit his error and released them from their cells, albeit with close surveillance. L handcuffed himself to Light and announced that they, along with the task force and Misa, would be living together in a new investigation headquarters.
As L and Light worked together to solve the Kira case, the two formed a close bond. Light was L's only friend and an intellectual match, and L began to hope in his heart that he was wrong, that Light was not a murderer, in spite of the certainty in his mind. The two of them made a brilliant team despite conflicting morals and L's repeated assertion that he still believed Light to be the original Kira. After many months they managed to capture the third Kira, Kyosuke Higuchi, and discovered that the method of killing was a notebook possessed by a shinigami named Rem. Before they could question this Kira further, however, Higuchi suffered a heart attack and died.
With the notebook safely locked away and the third Kira's identity discovered, L was forced to release Misa Amane from the headquarters and removed the handcuffs which connected him to Light. Light, despite being free to go, decided to remain at headquarters to continue the search for Kira. This made L uneasy, for he sensed a clear change in the atmosphere since the notebook had been found. He knew that it was no longer he who was watching Light, but Light who was watching him. He could feel that the end was approaching.
Ultimately, L realized that the only way to prove that Light and Misa are the first and second Kira was to test the notebook and the rule that claimed a user would die if he did not continue writing names every 13 days. He announced his plan knowing that it would force Light to make a move to kill him before the test could be performed. He was correct. Light manipulated the shinigami Rem to write L's real name down in her notebook. L collapsed into Light's arms as his heart was failing. The last thing he saw was Light's victorious smirk, and he closed his eyes assured that he had been right all along.
When he awoke he was in a world that was neither heaven nor hell. He was alive and (somewhat) healthy, in a place called Econtra, wearing a biometric cuff on his right wrist.
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