Btooom! Vol. 21 (manga)

While Iida and Perrier finally make their move to take over Tyrannos Japan from within, Ryouta and Himiko are in a tight spot on the island. In his dreamlike state, will Ryouta end up doing something truly unforgivable?! But before they know it, Kira's back on the scene, and he has his sights set on SAKAMOTO! Kira's stronger than ever before-how did a child become one of the most dangerous players in the game?!