After L's death in the anime "Death Note," Light Yagami initially appears to be unaffected and even celebrates his victory over L. However, deep down, he feels a mix of relief and emptiness as L was his intellectual rival and a significant part of his life. Light becomes more arrogant and confident in his abilities after L's death, but he also starts to spiral into paranoia and obsession as he realizes that there are others who could challenge him like L did.