In Kyushu Island, in Lake Ikeda (which is the largest caldera lake on the island), there lives a lake monster that goes by the name Issie. According to the mythology behind the lake, Issie was once a white mare living with its little foal on the shore of the lake. This little foal was then kidnapped by a samurai, which caused Issie great despair. Issie then jumped into the lake and transformed into the humongous saurian beast that frequently goes to the surface to look for its long lost foal.
In terms of what this creature might really be, if eyewitnesses are to be believed; then this might be a creature similar to the very infamous Loch Ness, or the lesser-known Champ. If not a Suaropod, then Issie, pronounced as Isshy by the locals, might be a serpent-like creature measuring almost 30 feet long.
Although there have been a lot of people who have claimed to seen the mysterious creature, no real concrete evidence have yet been put forward. The best proof that Issie exists is due to sightings by Yutaka Kawaji as well as 20 people from his family. Issie suddenly made an appearance during a family get-together in 1978 and people claimed to have seen humps on the lake measuring 16-feet long and rising 2 feet high from the lake