Materialization Effect (crossover harem x male reader)

Y/N's closest friend finds a notebook with the title Materialization Effect. It claims to bring anyone who is dead or fictional into real life by materializing them. Although he thinks its a prank at first, he quickly begins to see the notebooks power.

How will Y/N use this power? And how can he explain the sudden appearances of people who bear resemblances to fictitious characters? Only time can tell...