Hataraku Maou-sama!!

Synopsis

Later that night, Emi meets up with Maou and his group at the lighthouse to explain everything she learned from Camio. They reveal that Olba travelled to the demon realm and spurred discourse among the demons by informing them of the sacred sword in Tokyo, and how it will allow them to rule over all, giving them a Yesod fragment to help track it down; these hardliners being led by a demon known as Barbariccia. Emi also reveals that a group of hardliners is about to show up at their location, and adds they chose to keep it a secret from Amane due to her unknown immense power, and their intention to resolve things without killing. The hardliners, demons known as the Malebranche, led by Ciriotta, arrive through a gate and Emi goes to fight them. Amane then appears to hand Maou his sword, putting her trust in them to get the job done. Emi confronts Ciriotta, struggling while holding back against them, until a fully powered Maou appears to put the demons in their place. He commands the army to return to the demon realm, claiming to have the sacred sword already in his position, and that he is building power until his return. Amane uses the lighthouse to send the demons and Camio back to the demon realm, and Maou and Emi use their remaining strength to close the Gate, washing up on the shore soon after. The next morning, Amane relieves the group of their job, as they discover the beach is actually a safe spot for souls to recover and their presence has caused them to start to lose their human shape. After revealing herself to be the daughter of Earth's "Binah", she tells them to find and restore the "Daath" of their world, and with a snap, she and the beach hut vanish, leaving behind everyone's payslips and a tourbook. As the group sightsee around Chōshi, Maou marvels at human's ingenuity and how he wants to rule over them too. He gives Emi the Yesod fragment from his sword and declares his intention to conquer everyone, leading to a freak-out from Emi and Chiho.

(Source: Wikipedia)