As one of the seven mermaid princesses, Lucia must travel to the human world to protect the mermaid kingdoms.

Iwaki Tomonori is a schoolboy who happens to have a crush on his teacher, but learns she has become engaged. Brokenhearted, he soon meets a girl named Rizel, a biochemically engineered human, who he learns the Japanese government has married him to against his will.

To save his mother, a kind-hearted boy and his tiny daemon friend set out on a journey across post-apocalyptic Japan as dark forces close in.

In 19th-century London, class lines are sharply drawn, and the social standing to which people are born dictates the path their lives will follow. Emma, an honest and hardworking young maid, never felt her place in life to be a burden. But then she met William, a member of the gentry and the eldest son of a wealthy family. His warm smile and earnest affection threaten to capture her heart... but can love truly conquer all?

Denji has a simple dream—to live a happy and peaceful life, spending time with a girl he likes. This is a far cry from reality, however, as Denji is forced by the yakuza into killing devils in order to pay off his crushing debts. Using his pet devil Pochita as a weapon, he is ready to do anything for a bit of cash.