post an 日本动漫 series in which the main lead died!

Air. That one nearly made me cry . .

Code Geass

日本动漫 K

DeathNote

Main Lead l will Die...............!!!

Vampire Knight. -SPOILER- Yuki kills herself to turn Kaname into a human at the end of the story.

Shiki

himari takakura from mawaru penguindrum... she dies several times throughout the show

Blassreiter

Aura Battler Dunbine has the protagonist among the casualties in the last episode.

HA! Someone 发布 L. He wasn't the main character. He was the main antagonist, however.
But still, the correct answer would be in Death Note, Light Yagami gets shot 由 Matsuda at the end and dies from Ryuk 写作 his name soon after.
It was a really depressing scene, actually.

Akame ga Feels.