Eirin is performing a modified version of the early 70s pop hit, Watashi no Kare ha Hidarikiki (My Boyfriend is Left-Handed), with the lyrics changed to "Watashi no, watashi no Kaguya... takiki!" I can't say any better than that, because I don't know what "takiki" is supposed to mean.

(And now I'm going to have that song stuck in my head all frigging night, so I really hope that helps. :P)

Tetrominon said:
Eirin is performing a modified version of the early 70s pop hit, Watashi no Kare ha Hidarikiki (My Boyfriend is Left-Handed), with the lyrics changed to "Watashi no, watashi no Kaguya... takiki!" I can't say any better than that, because I don't know what "takiki" is supposed to mean.

(And now I'm going to have that song stuck in my head all frigging night, so I really hope that helps. :P)

It does thank you and you are not the only one with it stuck in your head

Tetrominon said:
"Watashi no, watashi no Kaguya... takiki!"

The letters are distorted. It is 左きき(Hidarikiki), not たきき(takiki). A pun of Kare-wa <-> Kaguya.

Ahhhh, of course. Handwritten kanji strike again. Cheers, henmere.