Hangyodon no Parallel Daisakusen

A three-part series follows time travel adventures involving Hangyodon and friends. In the first part, they travel to the prehistoric past via a time machine and experience a dinosaur-era adventure. The second part sends them to the 25th century to stop Xian Long Bao and rescue Princess Kingyochan and her father, Emperor Chuuka Taijin, possibly encountering known characters. In the third part, Hangyodon, Sayuri, and Otamaro are sent to the Edo period at the request of a wealthy Sea-Otter and his ghostly ancestor to recover a golden Kannon statue. There, they learn of the Full-Moon Kozou, a thief planning to steal the statue on the next full moon. The story explores the thief's true identity, the connection to Kingyo-chan's Edo-era ancestor, and whether the group can successfully retrieve the heirloom.