Second season of Sengoku Choujuu Giga.

In the late Edo period, Japan had experienced an unprecedented crisis by Kurofune (Black Ships), the ships from foreign countries. But a giant robot called Onigami, which has existed since ancient time, dispelled the Kurofune ships and the exclusion of foreigners was accomplished. The story begins in Japan where Meiji restoration in 1868 didn't happen. The tagline says, "I can be the greatest man in the world, because I am a virgin!!" (Source: Crunchyroll)

The series follows pre-teens Dan Kouzo, Shun Kazami, Wynton Styles, Lia Venegas, and their dog Lightning. They are known as the "Awesome Ones" and make videos on the website ViewTube. Eventually, they stumble across a race of battling biomechanical creatures called Bakugan. They soon befriend the Bakugan and begin to battle each other with them, all while defending their neighborhood from thugs who use the Bakugan for malicious purposes. (Source: Wikipedia)

After of the big war between angels and demons, the Earth is almost destroyed and his cities devastated. Wanted to restore the peace and the harmony, four young child decides to fight against the army of evil that rules the world for to eradicate to the Earth and give them back to hell. (Source: IMdB)