Think about the whole story line

This article of Steins;Gate makes it clearer than Line 0. Line 0 has too many points to connect to the future, and it is easy to be confused. The b line is the line that originally happened in this world, the assistant died at the beginning, and his father went to Russia with papers and metal Upa and was rescued, and Russia studied the time machine. The American forces represented by the assistant's professor also began to use the intellectual heritage left by the assistant to develop a time machine. The Third World War broke out. Because Gun Lun invented dmail, saved his assistants, and helped his friends realize their wishes, he was also intercepted by sern, leading to a dystopian totalitarian world where everyone else was killed, and Suzuha had never even seen dad. Sern will take Gun Lun's assistant Azhi and kill the useless Mayuri. If you want to save Mayuri, you have to cancel all dmails at the cost of the death of the assistant. For the observer, the unobserved line becomes nothingness, so the whole world view is a single world line. Observers determine reality. Suzuha, who came back from the b-line, wanted to change the world of the third war, so he asked Gang Lun to go back to the rescue, but the first time Gang Lun killed his assistant by mistake, he was depressed and unwilling to touch time travel again. Mayuri didn't want to see Gunn so depressed, so she decided to take a time machine with Suzuha to wake him up when he failed to save him for the first time, and the world line was tied so that Mayuri would be bombed as soon as he got on the time machine. Lose. Gang Lun finally woke up and decided to use the time jump machine to help Mayuri go back, but unexpectedly jumped to 2036 and found himself in a vegetative state for 11 years after being tortured in 2025. In 202, he decided to use time to jump back to 2011. (In order not to cause a time paradox, only time jumps can be used). Liu Hua's death in 2036 made him realize that he had to take responsibility and changed back to Phoenix Academy. (Mayuri of this line disappeared in the third world war because he disappeared in a time machine) In 2025, he learned through the guidance of AI assistant that he could deceive the world to achieve his goals. After jumping back, Gang Lun successfully made Mayuri travel back by solving the three forces. Mayuri called her self in 2010, slapped Gunn to wake up, and it fell to 18,000 BC.

Gang Lun traveled back to help his assistant feign death and replaced the metal Wupa, so that the paper was not discovered, and successfully reached the Steinsite Gate line. Then Gang Lun sat in the time machine and went to the normal year of 2025 on the b-line. He recorded a video for himself in 2010, and asked Azhi to record a video for Suzuyu. The whole story is a loop.

In 2025, when he was going to die, Gunn used a time machine to deceive the world to save Mayuri.