Cyclops Shōjo Saipu (Japanese: サイクロプス少女さいぷ～, Hepburn: Saikuropusu Shōjo Saipū, "Cyclops Girl Saipu" or "Cyclops Girl Cypu") is a Japanese yonkoma manga series written and illustrated by Yasu Tora. It first appeared in Shueisha's Weekly Young Jump as various one-shot chapters from November 2010 to March 2011 and was then regularly serialized in the magazine from July 2011 to September 2014. Shueisha compiles them into four tankōbon volumes. It was adapted into an original net animation (ONA) in 2013. The manga focuses on the adventures of a middle school girl named Fuuka Saitou known for her height and hair that covered her left eye, earning her the nickname "Saipu" (based on cyclopes).

Fuuka Saitou, a middle school student known for her nickname "Saipu", has a brother complex towards her brother Hikaru. The story follows their daily lives as she tries to gain his affection through perverted ways.

Fuuka Saitou (斎藤 楓香, Saitō Fūka)

Voiced by: Mai Nakahara

Fuuka Saitou is a 14-year-old girl in her second year of junior high (8th grade).^[2] Because of her 180 cm (5 ft 11 in) stature and peekaboo bangs hairstyle, she is nicknamed "Saipu" (さいぷ), shorten for cyclops (サイクロプス, saikuropusu) from Greek and Roman mythology.^[1] Two years before the start of the series, when she was shorter than her brother Hikaru, Fuuka makes a promise that she would grow up and marry him.^{Ch. 1} She has a strong brother complex and is extremely sensitive and jealous of any female affections directed towards him. Fuuka often cosplays as girls that Hikaru liked^{Ch. 11, 22, 35} and teases him with perverted innuendos, although some situations turn out to be innocent wordplay.^{Ch. 1, 2} She is admired by everyone for her model-like figure; she also is a resourceful cook and has excellent grades. When asked the reason for hiding her left eye, Fuuka replies that it hid a dark power.^{Ch. 35}

Hikaru Saitou (斎藤 光, Saitō Hikaru)

Voiced by: Kengo Takanashi

Hikaru Saitou is Fuuka's older brother and the object of her affection; he is a first-year university student currently living at home with his younger sister. He is the shortest at 165 cm (5 ft 5 in)^[3] in his family and has to regularly fend off her teases and advances,^{Ch. 1} as well as others in the series. When Fuuka acted cold on him the other day, Hikaru becomes flustered.^{Ch. 41, 42}

Fuuka has several female classmates that she regularly hangs out with: Rin (りん) (voiced by Saki Fujita), who wears pigtails, is strongly perverted that her other classmates often ignore her comments;^{Ch. 5, 7, 16} Nacchan (なつ, Natsu) (voiced by Kahoru Sasajima), acts as the straight-man as she retorts Rin's perverted comments;^{Ch. 2, 39} Class Representative, who wears glasses and braids and secretly crushes on Fuuka;^{Ch. 2} and Kamiji, a tall girl with short hair who gives off a cool attitude like a delinquent, but is actually soft-spoken and rather self-conscious.^{Ch. 3}

Other recurring characters include: the Saitou parents, who approve of Fuuka's brother complex; Hikaru's college radio club friends Sato and Suzuki,^{Ch. 6, 9} and their flirtatious president Eri, the last of whom causes Fuuka to be extremely jealous;^{Ch. 29} their cousins Akari and Souta Haruno, who conspire to split them apart;^{Ch. 12} and their neighbors the Yamakuras.^{Ch. 24}

• ^ "Ch." is shortened form for chapter and refers to a chapter number of the Cyclops Shōjo Saipu manga