Space Monster DEMEKING
デメキング DEMEKING (original)
Junior high school student Hiroshi, who will only play with younger children, meets the young, taciturn Hachiya as he rides his bike. Shortly after, a strange friendship begins to blossom between them. But then Hachiya disappears, leaving behind only the puzzling words, "I am going to fight Demeking."
Starring Takeshi Nadagi, Manami Honjo, Guts Ishimatsu, Takashi Matsuo, Kohei Kiyasu, Koji Yamamoto, Kōji Yamamoto, Punch Sato, Zenjiro
Watch "Space Monster DEMEKING" from streaming services Popcornflix, Tubi TV released in 2009. It's a drama and action & adventure movie, and has a rating of 4.8 out of 10 from Imdb which is fairly low for this kind of movie, and is currently available to watch for free.