Spoiler Ahead.(very old manga but still). Does these 3 panels mean that Shiro died in the end. And the laughing in the end means that she is happy for the death. Can
Deadman Wonderland (Manga) - TV Tropes
Deadman Wonderland - Ganta Igarashi & Shiro Sticker – Great Eastern Entertainment
shiro and igarashi ganta (deadman wonderland) drawn by iroiroiro | Danbooru
Deadman Wonderland Mofumofu Lap Blanket Ganta/Shiro (Anime Toy) - HobbySearch Anime Goods Store
Stream Shiro - G-G-Ganta FIGHT! (Deadman Wonderland) by Ephemeral | Listen online for free on SoundCloud
shiro, igarashi ganta, koshio karako, takami you, and kengamine nagi (deadman wonderland) drawn by kondou_kazuma | Danbooru
Deadman Wonderland Episode 10 – Only the Strong Survive | antiotaku