At the end of Sword Art Online (episode 25, ~21:40), Kirito says something in the presence of Leafa, Yui, and Asuna.
Despite being shown his lips moving, there is no sound and so the only hint is how his lips move. Since my knowledge of Japanese is far from extensive, I don't have the ability to read what his lips are saying.
What is it that Kirito said to the others in this final episode?