I don't know what crack other people are on, but I think it's a great ballad!

At first listen, I already like it, and trust me; when it comes to ballads it usually takes me a few listens or more to like it.
Koharu's singing has definitely improved, it still needs more work, especially holding notes, but she's gained much more control over it which is good! And well of course, the rest sound perfect as usual, Risa did well too!
It's quite easy to tell their voices apart actually, especiall Goto's and Koharu's.