Gridman

Yuta wakes up with no memory in the house of the girl Ricky. From an old computer, the robot Gridman speaks to him, which no one except Yuta sees. When the city is attacked by monsters, Yuta merges with Gridman and engages in battle. Together with Rikka and his friend Xie, he creates the "Gridman Alliance" to stop the attacks and find out who is behind them.