The Otherside?

I really enjoyed the first half of Sputnik Sweetheart. I thought that author had created an interesting cast of characters who each their own flaws and held a little bit of mystery. Intertwining these characters was an unique plot that got to the heart of discovering and pursuing relationships in a real modern way. The story took a turn in a different direction when Sumire goes missing. I feel that the author took what was a good plot and turned it into a attempt to create modern, mystified, transcendental work. It's just unbelievable and me as the reader had a hard time comprehending it. I wish it had an alternate ending.