This is the definition of insanity, doing things over and over and over again, expecting a different result. Time travel stories and future prediction stories are always hard to make comprehensible, because you have to plan everything ahead of... time and have multiple flashbacks and flashforwards in order to keep everything consistent. Poor Yuuna only wants to save her loved one, but i'm really sad to be able to predict what is going to probably happen, i read this series and didn't take it seriously, but now at the end, i think my opinion has changed.