Sachi Kokuryu

In colonial Singapore in the 1930s, Fei and Kai have the same dream: to become great violinists. The Japanese invasion of 1941 had a completely different fate in store for them: Kai joined the resistance, while Fei spent his life searching for this lost friend. (Télérama)

The story is set in the near future when GunPla Battles, competitions that pit Gundam plastic models against each other, have become popular worldwide in the "Second GunPla Boom." Sei Iori, a first-year middle-school student and the only son of a model shop owner, is talented at building GunPla, but inexperienced in the GunPla Battles. He encounters a mysterious boy named Reiji, who happens to be an accomplished Gundam Fighter. Together, they strive for the GunPla Battle world championships. (myanimelist.net)

After finding out he is the son of the great leader of Ohu, Gin, Weed sets out on a journey to find his father. However, with many friends to find, there are many enemies. (imdb)