I am inside you, and I am (only) one, but I am yours
Viðmerking um umsetingina
I don't fully understand the meaning of this strange sentence. The Japanese is also a little strange, because the form used for "I am one (person)" is usually used to mean "I am one OBJECT." Anyway, the meaning is as above. Note: the Japanese forms used suggest that the writer of the text is a woman.