There are 3 books in the Isekai Kids series. The newest book is The Haunted Mansion which came out in 2022.

1
Portal to a New World

By Thomas Shuler , Rachel O'Brien (illustrator) ,

Book cover of Portal to a New World
Why do we love to play games? Because we are able to explore new worlds, go on adventures, and even come face to face with danger! And since games come with rules, it has to be safe, right?
Olivia Green loves games! She plays them all: Board Games, Table Top…
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2
The Lair of the Black Goblin

By Thomas Shuler , Rachel O'Brien (illustrator) ,

Book cover of The Lair of the Black Goblin
Olivia the Orc is Back!
Olivia Green and her friends Jimmy McKenzie and Grant Hanson have returned to Otherworld for another adventure.
Now that they have completed the tutorial, the three friends can enter and exit as they please. But Otherworld has more tricks up its magical sleeves!
A new…

3
The Haunted Mansion

By Thomas Shuler , Rachel O'Brien (illustrator) ,

Book cover of The Haunted Mansion
Olivia the Orc is Back, and this time she is bringing more friends!
Olivia Green, Jimmy McKenzie, and Grant Hanson are back to Otherworld, and Back to School for even more adventures.
With the Black Goblin stopped, Olivia and her friends have much more of the Otherworld to explore. At…