If you're looking for manga similar to Cheorin Samchongsa, you might like these titles.
The adventurous and kind-hearted Van is a 17-year-old boy who lives in a small village on Planet Zi – a world where giant beast-like mecha known as Zoids live alongside humans. One day, while out on his hoverboard, Van is chased by a group of bandits, and ultimately finds himself in the midst of some old ruins. To his surprise, he finds a hidden passage that leads him to pods containing a wild Zoid (which he names Zeke), and an amnesiac girl named Fiona. To protect his new friends from the bandits that lurk around each corner and to help Fiona regain her memory, Van decides to travel alongside them; and thus their adventures begin!
Together with his robotic pet, atom, Sho Tobio travel from Japan to Dong Bei City in China. His mother is a scientist assigned to re-evaluate Japanese weapons left in China as the result of Japanese colonialism. Some of those armors are producing dangerous gas. Moreover, the sentiment for Japanese is stabbed inside local people’s mind. Atom is the only one he can talk to. One night, Sho was having a phone conversation with his grandma in Japan when the electricity blacked out. Suddenly Atom reacts into some transmission and runs away. Sho is trying hard to catch him. When he finally gets his hand on his dog, they’re already in some kind of basement. Right in front of their eyes lays a gigantic robot...
Ten years ago, Tatsuya Yuuki befriended a boy who taught him all about Gunpla and battling. This is the story about the GBF world back then, showing Tatsuya’s story and progression as an amazing builder and fighter!