Natsuki has been acting strange and seems to have his head in the clouds through everything he does. After being interrogated by Minamo and the others, he reluctantly confesses to them that he kissed Atri in the ocean. 
What are you mumbling to yourself for?
عمّاذا تُتمتم مع نفسك؟
Was murmelst du
da vor dich hin?
¿Qué haces murmurando aquí solo?
¿Qué haces murmurando aquí solo?
Encore en train
de marmonner tout seul ?
Cosa stai borbottando qui da solo?
O que você está resmungando aí sozinho?
Что вы там бормочете?