Shidou Itsuka carries on with his quest for Ratatoskr in finding Spirits and trying to seal their powers, all while maintaining his relationships with the ones he had already sealed. Moreover, as new Spirits appear, he must undergo more complicated trials—all to put a stop to further disasters as he discovers more about the Spirits' origin. [Written by MAL Rewrite]

Thirteen years after their sudden disappearance, an alien race known as the Heterodyne resurface without warning. To combat the Heterodyne, three office workers from the 21st Century Security Corporation operate Dai-Guard - a giant robot no longer regarded as an oversized paperweight. Unfortunately, Dai-Guard is somewhat obsolete and in disrepair. It's a tough job, but salarymen can also save the world. (Source: ANN)

Sana is not an ordinary little girl; she possesses a special ability known as "Alice's Dream." Due to her power, which allows her to create anything from her imagination, all that she knows is the laboratory where she is a test subject. Wishing to experience the outside world, she escapes and meets a stubborn old florist named Zouroku Kashimura in a convenience store. All too soon, her pursuers catch up and Zouroku is roped into Sana's troubles. However, far from trying to distance himself, Zouroku extends a hand to help Sana. Following his values and sense of justice, he even gives the pursuers a piece of his mind! Zouroku then offers Sana a place to stay, beginning the daily life and struggles of the unlikely duo. [Written by MAL Rewrite]

Aine Yuuki, who is a regular student at Star Harmony Academy's normal division, meets Mio Minato from the idol division, who invites her to join Aikatsu to fulfill Aine's goal to make friends. She also befriends Maika Chōno and Ema Hinata who are also idols. Aine and Mio form a pair to become best friends to become the bright "Diamond Friends". Karen Kamishiro and Mirai Asuku are categorized as "Diamond Friends" and are in the Diamond Class! (Source: Wikipedia)