Demeking (aka Space Monster Demeking aka Demekingu) is a 2009 daikaiju film released in Japan that so far has avoided much exposure in the US and has really avoided clear images of the title monster. Demeking is based on a manga and much of the imagery is related to a dude riding around on a motorcycle. So it’s got that going for it.
Pictures from UndeadBackbrain more here

Trailers uploaded from NipponCinema here and here
Set in a dreary port town in 1970, the story revolves around a group of boys led by the older Kameoka (Kohei Kiyasu) who form their own exploration group. One day Kameoka meets a strange man named Hachiya (Takeshi Nadagi) who works at the local amusement park. Hachiya is convinced a vision of the future he experienced is real, and one day he will have to fight a giant monster called Demeking to stop it from destroying Tokyo. When the time comes, Hachiya suddenly up and leaves. However, with the guidance of a note he leaves behind, Kameoka and his friends set off on an adventure to discover the true nature of Demeking.

Official site
Thanks to Avery

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