Ocean on the Mountain Ridge

A favorite of kids far and wide, the Dinosaur Professor, Shinya Makino has arrived in Hoshimoto City. And it seems he wants to investigate the fossil discovered at the mountain ridge. While Yuma is excited to see his childhood hero in action, Hiroshi seems troubled. As it turns out, the Professor was Hiroshi's teacher! Among all this, a lake suddenly appears at the excavation site...