Bullbuster

Mysterious creatures have been terrorizing an island, forcing locals to flee their once-thriving home. With government funds lacking for monster eradication, Tajima purchases the only construction company left and transforms it for the task. Thankfully, the brilliant Testuro Okino and his new robot, Bullbuster, come to their aid. But the team is on a tight budget. Can they save the island?

(Source: Crunchyroll)