Koukaku Fudou Senki Robo-san(2014)

Koukaku Fudou Senki Robo-san is a comedy series set in a forgotten ghost town where an ancient giant robot once saved Earth from alien invasion. Decades later, humanity has lost the knowledge to operate the colossal machine. Professor Tachibana remains convinced the robot can be piloted again and searches tirelessly for a worthy operator. His plans take an unexpected turn when he discovers eight middle school girls have claimed the abandoned robot as their secret gathering place. What begins as a quest to restore a legendary defense weapon becomes a quirky tale of friendship, discovery, and unlikely bonds between the girls and their mechanical sanctuary.