I went a little crazy with alliteration & poetic language in this part, but here you go.
Kira
After several days of relentless research and myriads of marshmallows overflowing in cups of liquid chocolate, after contacting the Japanese police in Kanto, Ryuzaki made plans to test his hypothesis by which he could catch Kira. He called the news network to test his experiment and received the okay for that Thursday night at 9 pm.
Ryuzaki would use a to-be-executed criminal (Lind L. Tailor) to pose on television as L. If Tailor died of a heart attack shortly after his introduction, Ryuzaki's deduction would be correct: Kira needed a name and face to kill. If Tailor lived, Ryuzaki would have to start from scratch. Starting from scratch would imply that he had been mistaken in his hunch. His faulty hunch would imply that his intuition was unreliable. The idea that his intuition was unreliable was almost unbearable. These inadequacies would rapidly snowball into depression. He would be left with nothing but computer cords and empty coffee cups. So as Kira-esque as it was to think it, Ryuzaki was depending on – no, hoping for –Tailor to drop dead of a heart attack on television.
It was at this moment, minutes before the broadcast of Lind L. Tailor on a supposedly worldwide television station, that Ryuzaki realized how similar he was to Kira. Words unwittingly came rushing through his head.
Childish. Hates to lose. Clever. Fights for his own ideas of justice. Willing to go to extremes. Common goals: justice, success.
Power.
Ryuzaki couldn't (wouldn't) dwell on it.
He turned on the television. The screen illuminated ominously in Ryuzaki's dark room, perhaps as a forewarning of the next few minutes, perhaps a mere coincidence. A cruel coincidence.
Ryuzaki was not nervous, never nervous. Analytical was a more apt word. Contemplative. Speculative.
He watched diligently, curiously, eagerly, as Tailor delivered his Kira spiel, in which he essentially invited Kira to kill him right on the spot. As Tailor exposed himself as L, Ryuzaki wondered if Kira believed the stunt. Did he truly believe that the esteemed, world-renowned detective L would reveal his name and face on television for Kira to murder with an open invitation? Come to think of it, maybe having a criminal pose as himself on television wasn't a very good idea after all. If Kira saw through it, he would understand L's intentions and wouldn't kill Tailor, to keep him guessing…
The moment passed. Lind L. Tailor's face twisted in sudden agony. Ryuzaki's eyes widened as his pulse began to quicken. He watched in fascinated horror as Tailor took his last breath, watched with a sense of relief as men in black suits from off screen lifted Tailor's lifeless body and carried it away from the camera. All this meant that Ryuzaki was closer to finding Kira, with the knowledge that Kira was based in Japan, but more specifically, near Tokyo. He even had it narrowed down to the Kanto region of Tokyo. His hunch had been dead-on, his intuition was accurate, he was right, he was vindicated.
He smiled. For justice, for vindication, for himself.
Ryuzaki picked up his wireless microphone and pressed a button that would disguise his voice. He watched his pseudonym, the English letter L in the font Old English Text, appeared on the computer monitor, then ominously on the television screen.
"Kira… I am L." He managed to keep his voice flat as usual. "I couldn't believe it until I witnessed it myself. You can kill without physically touching a person. The man you just killed, who died of a heart attack, was in fact a criminal. He would have been executed this very hour, had you not killed him on television. If you are so sure of yourself, so confident that you can kill me without even touching me... kill me. Go ahead. Try to kill me."
He challenged Kira so forwardly primarily for dramatic effect. He knew he was perfectly safe. He was beginning to feel a little overconfident and brash.
"Come on. Kill me! What are you waiting for?"
After a few more seconds of pause, Ryuzaki began to speak once more.
"So it would seem that you cannot merely wish someone dead. You need certain information. In return, I will tell you that this in reality was not a worldwide broadcast. In fact, the only place it aired was in the Kanto region around Tokyo. When the murders first begun, they were primarily in Japan. The first criminal was a victim, a method for you to test your powers. At first the Japanese police thought little of this murder, but it reveals that you, Kira, are Japanese, or at least based in Japan. The fact that you killed Lind L. Tailor confirms this theory. At this rate, with this information," he paused once more, a small smile dancing on his face, "I may send you to your execution soon.
"I am very curious as to how you carry out your murders. I wish I knew. But I suppose I'll have to wait until I catch you to find out. I will find you… Kira."
Ryuzaki (now more comfortable as his pseudonym) turned off the microphone and closed his laptop. He felt more satisfied than he'd been in… months? Years? Time seemed to have melted.
In spite of the fact that this broadcast was a milestone in the case, he knew the battle was far from over. Things could get better from here, or they could get worse. But for now, Ryuzaki felt invincible. At least for a while, there'd be no more nightmares, no more anxiety, no more forcing himself to sleep at inconvenient hours to appease Watari. And for now, that was enough.