The story revolves around a girl named Yuuka, who encounters a being from the depths of the Earth named Chii-chan (a pun of chiteijin, the Japanese word for underground-dweller), and an alien named Ucchan (a pun of uchuujin or alien). The story follows their heartwarming and chaotic everyday lives together.

AD. 2023, Tokyo. Because of the change of the society such as internationalization and enlargement of the trading, the dark side of the society also continues changing. The criminals are getting deep, and their organizations are increasing its size, then the peace and security is getting worse. The government takes it seriously, and decides to introduce an innovative system. In order to cope with the special criminals, an extralegal police is founded. It is a special criminal team, Warriors, which consists of a few elite members. (Source: AnimeNfo)

Ema Hinata is a sweet girl with only her father to call family. One day, she learns that he will be remarrying Miwa Asahina, a wealthy fashion designer. Though she's glad she has a new place to call home, the family she gains is greater than she could ever imagine—Ema now has 13 step-brothers! Wishing to give her father space, she moves into the Sunrise Residence where her brothers live . As she settles in, Ema realizes she may not experience the loving kinship of a family that she has always longed for, as many of her new brothers exhibit feelings toward Ema that aren't just familial. With each brother desiring Ema's attention in his own way, will she be able to work toward a happy ending for all, or will she choose one brother that has stolen her heart? [Written by MAL Rewrite]

With great advancements in technology, mankind has created hIEs, human-like robots that act as public and personal servants for society. Unlike many others, the kind-hearted high school student Arato Endou treats hIEs as equals, but his financial situation keeps him from ever owning one. However, his normal life is shattered when an ordinary run to the local grocery store goes horribly awry. Viciously assaulted by a hacked hIE, Arato is on the verge of death; but luckily, he is saved by an abnormal hIE carrying a weaponized coffin. Her name is Lacia, one of five highly advanced hIEs that recently escaped the clutches of the mysterious MemeFrame Corporation. Faced with a hacked car threatening to run them over, Lacia offers Arato a deal: in exchange for saving his life, he must register as her new owner, thus taking full responsibility for her actions. With little choice, he decides to trust this artificial girl and allows her to live in his home. Though Lacia begins to adapt to her new, peaceful lifestyle, she warns the entranced Arato of one thing—she does not have a soul. [Written by MAL Rewrite]