Wen Ye Fan: a Dream in a Box

I thought I was dead, but I survived because of the demon's summons for sacrifice; I thought I was leaving, but I was accidentally awakened again a thousand years later; An enemy from thousands of years ago suggested that you directly join his army and become his shikigami, and then he was beaten by you; A certain dog comparison from a thousand years later caught your attention. After getting along for a while, you realized that you were stuck in a quagmire and couldn't get out... The heroine travels through time and has countless code names (not vests); The protagonist Wenye randomly drops a small story from the Heian period (the heroine travels through the past of the first life); CP tentatively determines a bandage waste device (but the emotional line is difficult to handle)