SOS! Tokyo Metro Explorers: The Next

While getting ready for a move, elementary schooler Ryuhei stumbles upon his father’s old notebook, which describes a search for hidden treasure in Tokyo’s underground tunnels. Curious, he teams up with three friends from an online chat room-plus his little brother-and sets off to find it. Instead of treasure, they uncover a strange underground world filled with oddball residents, including an elderly soldier who still believes he’s carrying out a mission from World War II.