After the resolution of the debut, Kate and her Doll Emilico have officially become residents of the Shadows House. However, they are under constant vigilance by the Star Bearers—an elite group in charge of the children's wing. In order to escape from their surveillance and the morbid methods they use to keep everyone's loyalty in check, Kate and Emilico must be wary of who to trust and aim to become Star Bearers themselves. Meanwhile, the Star Bearers have encountered their own problems. A mysterious robed figure dubbed Master Robe has trespassed and roams around the children's wing. At first, Master Robe is deemed harmless, but more incidents start occurring that endanger the Dolls' lives—all of them pointing to the suspicious individual. To improve her reputation, Kate decides to solve the mystery herself. Yet, with so few clues and so many suspects, searching for Master Robe and their motive for attacking the mansion proves more challenging than she imagined.

The Shadows, characterized by their pitch-black appearance and tendency to emit soot when agitated, are a family of nobles who reside in a colossal manor deep within the mountains far from other humans. When a Shadow child is nearly of-age, they are assigned a Living Doll who acts not only as their attendant but also as their second half—the faces they could have had if not for their complexion. Emilico is a cheerful, newly created Doll who serves a rather soft-spoken master named Kate. Despite their difference in personalities, Emilico does what she can to carry out the needs of her master. As she learns more about her role and duty, Emilico begins to meet her fellow Dolls and their respective masters and comes to know more about the purpose of her existence. Do not fret over trivial matters, says one of the rules by which all Dolls must abide. But how could the ever-curious Emilico do so in the face of the deep secrets that the Shadows House holds?

After leaving her idol career behind, Fuuka Miyazawa finds herself on a spontaneous flight to Okinawa instead of returning home to her pity party in Morioka. Bearing a heavy heart and nowhere to go, she aimlessly wanders around the area until she stumbles upon Gama Gama Aquarium—an aging aquarium on the verge of closing down. With a lack of visitors and costly but necessary repairs needed to keep its doors open, the director is faced with shutting down the establishment for good by the end of the summer. The director's aquatic life-loving granddaughter—Kukuru Misakino—cannot stand the thought of the aquarium closing and is determined to make enough money by the end of the season to keep the doors open. Seeing the unique magic of the aquarium, Fuuka begs Kukuru for a job; however, she soon finds that her lack of experience makes her more of a hindrance than anything else. At the same time, Kukuru realizes that her ambitious goal might be more than she can handle. With mounting pressure from all around them, will Kukuru and Fuuka be able to save the one place they hold close to their hearts?

One day, a city suddenly disappears. Takuya, a professional by-the-contract courier and lone wolf, meets Yuki, the only survivor from the city's extinction. The two rely on a message from Yuki's father, who was heard to be missing, and head toward the disappeared city, Lost. However, unexpected obstacles strike before the pair, with the reality especially shocking for Yuki. Before them are the feelings of those left behind, a mysterious group manipulating in the shadows, and unveiling the hidden conspiracy. Takuya and Yuki, who both were initially strangers, would deepen their bond during the journey and unravel the mystery of the Lost city. (Source: MAL News)