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. 
Oh, I learned about the 
theory of relativity today.
اليوم تعلّمتُ نظريّة النّسبيّة
Über etwas,
was „Relativitätstheorie“ heißt.
Me enseñó la teoría de la relatividad.
Me ha enseñado la teoría
de la relatividad.
D’un truc qui s’appelle
la théorie de la relativité.
Ah, sì. Ci ha insegnato una cosa
chiamata "teoria della relatività".
Hoje aprendi sobre algo chamado
Teoria da Relatividade.
Ах да! Она рассказывала
о теории относительности.