Why did the man at the Stone Gate of Destiny just send a shepherd to his past? When Li Hong is alive, it will change the future.

This involves the setting of the world line and the theory of space-time jump.

Rintaro, the protagonist, realizes that the time machine he made can only change the development of the world line by changing the thoughts and behaviors of himself and others in the past, so he has to send short messages to his past self through his mobile phone in order to choose different plots.

The man's resurrection assistant before was strange because in his understanding, the assistant should have died. Later, after realizing that the boundaries of the world can be changed, he embarked on the road of saving his companions and the future.

LZ, if you keep watching, you will find that this is a very beautiful animation and will never let you down.