Last Period: The Story of an Endless Spiral (ラストピリオド~終わりなき螺旋の物語~, Rasuto Piriodo: Owarinaki Rasen no Monogatari) is a Japanese online RPG created by Happy Elements. It was released in Japan in May 2016 for Android and iOS devices. An anime adaptation by J.C.Staff premiered on April 12, 2018.
"Period" is how magic users called who beat "Spiral"—monsters that were summoned from isolation. Due to the rise of these beings, 14-year-old apprentice Period Haru, who is a part of the Eighth Arc-end Division, is called to break the cycle and cast himself into the endless battle. However, a mysterious thievery occurred and sank the division into bankruptcy, forcing Haru and his other comrades have to leave their headquarters. To rebuild a branch, they have to overcome quest after quest.