I really like cucumber water (purified water with sliced cucumbers) but can't say that I would enjoy it mixed with soda of any flavor. The color is awful, looks like mouthwash.
Actually, I think it sounds delicious and I would love to try it. Hopefully they don't just sell it in Japan but also bring it here. Recently, one of my friend's who's moved to Japan to teach came back for a short visit. He brought a drink over to my house that translated from japanese to 'cow piss'. I tried this strange named drink and found it tasted alright... a little sour. Hope it wasn't made of the ingredient for which it was named.