Anyway, what is said after the song:
サンキュウ、baby．．．
あかね、そこまではなくても．．．
Sankyuu, baby
Akane, sokomade wa nakute mo...

Thank you, baby...
Akane, maybe that was a bit too much...

The song is called やさしい、いい娘になれない (yasashii, ii musume ni narenai) or "I won't become a sweet, good girl." Isn't there a way to fix this title?

But they say more stuff at the end. Akane says thank you like two times and I think it's Kasumi who says Akane's name and something else. I don't know Japanese but I can hear her say more that isn't in the lyrics after the lyrics...