[As she picks the saucer up, Mayuko's eyes glow. After all, what good would an internal library index be if she couldn't look up her bookfriend's references in it?

Her reply is in Japanese but thanks to the universal translator, it parses roughly as:]

The rock divides the stream in two,
And both with might and main
Go tumbling down the waterfall;
But well I know the twain
Will surely reunite again.