Title: Kodai Orinpikku no kiseki
Description: Their magic tree house takes Jack and his sister Annie back to a monastery in medieval Ireland, where they try to retrieve a lost book while being menaced by Viking raiders. It also takes them back to retrieve a lost story in ancient Greece, where they witness the original Olympic games and are surprised to find what girls of the time were not allowed to do.
Subjects: Magic, Brothers and sisters, Vikings, Monasteries, Fiction, Sex role, Time travel, Tree houses, Olympics