[Apocalypse Zombies] Chronicle of the End Times

He was just a simple book repairman. Then one day, a family heirloom seal hit him on the head, making him the successor to some kind of Book City. The price was being put through the wringer in a bizarre, mysterious space. He died in twenty-seven different ways, and what he found hardest to bear was that all twenty-seven deaths took place in the future, after the zombie outbreak. Who knew why he had to die over and over, reflecting again and again on what he had done wrong and why he had died?

After finally merging with the seal on his last attempt, he inherited the Book City and became a bona fide recorder of history. When the apocalypse arrived and the zombies broke out, he fled and rescued a soldier. What a strangely taciturn man. In the end, he even discovered the secret the soldier had been hiding. This guy really was...

This story has a male lead who is the uke.