Although many people say that it is a masterpiece, but my personal opinion, how to say it, because it is limited to a few main and supporting roles (even a bit of a harem trend), it lacks a little blood. The so-called saving the world only means destroying the time machine, which has a lot less impact than Re:0 (it can be considered that Re:0 is set to enhance on this basis). But there are a lot of words and settings that are quite touching. There are two ways to change the world line, one is to send text messages to the past, which will have a very serious butterfly effect, and the other is to send memories (Because people can’t travel through time, they realize the jump in time and space through memory, abstracting people into a kind of memory.) Of course, in the future, a real time machine will be developed, which can let people go back to the past, but it is still necessary to avoid and " self" contact. From changing the world line to the appearance of death, in order to save Mayuri, the male protagonist kept eliminating the impact of changing the world line before, but finally found that if he returned to the original world line, the female main dies, and the male protagonist falls into a contradiction for a while. Who should be saved, and how to save it (for this reason, the male protagonist kept trying, kept failing, and even gradually became numb, and seemed indifferent to Mayuri's death). The future male protagonist finally gave the answer, traveling through time and space to save people, but it did not change the established facts observed. For this reason, the illusion of the heroine's death is faked, which corresponds to the beginning of the story! The influence of the story on the world line jump, turning it into the memory of the world line before the jump will appear in the dream of the current world line person (but the male protagonist can keep the memory), time is divided into many world lines, maybe the world It hasn't changed, it's just experienced jumping between world lines.
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