For me Ningyo hime is her "most rock" track, followed up by Can We Go Back. Then I'd say Hashire!, LAx5, It's all Love!, Work It Out! and Poppin' love cocktail are pop-rock, and songs like FREAKY, Fake Tongue Selfish, Hurry Up! and Boom Boom Boys would be something like dance-rock, not full rock but not a plain dance song. Oh, and No Man's Land would be a rock-rap, a watered down version of a Linkin Park demo lol
And just to make myself clear, I am not demanding a full rock album but I see her going more into her rock side as an awesome opportunity for her to go on a new adventure, since going for urban or dance wouldn't be much of challenge. But then I don't even know if she feels the need to change for rock, this will depend on her. I just would like to see that happen
