Chibi Maruko-chan is a shōjo manga series written and illustrated by Momoko Sakura. The series depicts the simple, everyday life of Momoko Sakura, a young girl everyone calls Maruko, and her family in suburban Japan in the year 1974.

Half-demon twins Towa and Setsuna were always together, living happily in Feudal Japan. But their joyous days come to an end when a forest fire separates them and Towa is thrown through a portal to modern-day Japan. There, she is found by Souta Higurashi, who raises her as his daughter after Towa finds herself unable to return to her time. Ten years later, 14-year-old Towa is a relatively well-adjusted student, despite the fact that she often gets into fights. However, unexpected trouble arrives on her doorstep in the form of three visitors from Feudal Japan; Moroha, a bounty hunter; Setsuna, a demon slayer and Towa's long-lost twin sister; and Mistress Three-Eyes, a demon seeking a mystical object. Working together, the girls defeat their foe, but in the process, Towa discovers to her horror that Setsuna has no memory of her at all. Hanyou no Yashahime: Sengoku Otogizoushi follows the three girls as they endeavor to remedy Setsuna's memory loss, as well as discover the truth about their linked destinies. [Written by MAL Rewrite]

The show starts with the tale of Chitose Fujinomiya, a girl who goes from riches to rags and back and remains a snob despite it all. When her wealthy father dies, remaining debts leave Chitose almost broke, and she is kicked out of the affluent Tokai no Gakuen, or City Academy. She is left with nothing in the world but the clothes on her back and one pink goldfish named Gyopi-chan, the only memento she has of her father. Wandering lost, she collapses on the grounds of the poor-but-happy Inaka no Chugakko (Country Jr. High School), where the students are rough if friendly, and farm animals regularly roam the school grounds and even attend class. Recovering, she enters into the school but is repelled by its air of poverty, to which she is unaccustomed. (Source: AnimeNfo)

With the seniors having graduated from high school, the determined swimmers eagerly take on their futures with a dream to fulfill. Now attending Hidaka University in Tokyo, Haruka Nanase unexpectedly runs into Shiina Asahi, an old teammate and friend from his middle school days. Consequently, the troubling memories regarding his middle school swim team resurface, as it was a time when Haruka's views on swimming became negative and led him to quit the team. Haruka later reconnects with his other middle school classmates; all except for Ikuya Kirishima, who still resents Haruka for quitting the team, resulting in its disbandment. Aware of the issues between them, Haruka resolves to improve his friendship with Ikuya. However, he quickly realizes that making amends with an old friend isn't his only obstacle. Facing the reality and challenges of encountering higher calibre swimmers, Haruka must work hard to establish himself if he dreams of competing on an international level. [Written by MAL Rewrite]