Hunter x Hunter (2011)

Pouf and Youpi sacrifice most of their own bodies to heal Meruem, who rises stronger than before, but with most of his memories missing. Pouf then decides to take this opportunity to dispose of Komugi in hopes that Meruem never remembers about her at all, but is attacked by the other hunters, who realize, much to their horror, that the king is still alive and is about to return to the palace.