Laughable situation

Ryan closed the book and marveled at what he just read.

He had ended up reading more than one chapter and couldn't help but admire the ways he was fooled with and made to run around in circles.

"...haa," he sighed. There was no spec of radiation left in his body, so he was lying feebly with a giant book on his lap, weighing down on him.

Aside from the first half of the book and the very last page, the rest of the book went exactly like it did in his sister's novel.

There were other changes in details that could be brushed aside by inexperienced readers but in fact, held an invaluable significance in the overall narrative.

"Hiro was directly taken to the island as the headmaster's resident, not the castle I was taken to. This castle didn't exist in the original timeline."

There was also no mention of the demon king's army invasion that world consciousness spoke of and world destruction.