Koi Kaze

小日向七夏

Nanoka Kohinata (小日向 七夏 Kohinata Nanoka) is a 15-year-old high school girl who has moved to Tokyo to live with her father and older brother to attend school. A bright and active girl, she grows increasingly fond of her older brother, though is regularly annoyed with his brusque nature. Her friends unwittingly tease her about having a "brother complex", not realizing that Nanoka is actually falling in love with him.

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佐伯耕四郎

Koshiro Saeki (佐伯 耕四郎 Saeki Kōshirō) is a 27-year old largely-built man usually sporting a five o'clock shadow who works for a marriage-arranging company and lives with his father. He had almost completely forgotten that he had a sister until she came and moved in with them. He finds himself battling with society's definition of what an older brother should be and his sexual and romantic feelings for his sister.

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千鳥要

Kaname Chidori (千鳥 要 Chidori Kaname) is Koshiro's supervisor and appears to be around his age. While she is often critical of his sloppy appearance, she encourages him where she can. When Koshiro first sees Nanoka outside his job, Chidori encourages him to go on a date with her, not learning until later that Nanoka is his sister. She eventually becomes suspicious of the siblings' relationship, and upon realizing she is correct, attempts to get them to end things, even trying to convince Nanoka that she is dating Koshiro. When she realizes that the siblings can't be happy unless they are together, she decides to leave them alone in hopes they can live with their choice.

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環央子

秋本宵子,

Shoko Akimoto (秋元 翔子 Akimoto Shouko) was the ex-girlfriend of Koshiro Saeki at the beginning of the series. The reason she broke up with him was because she believed that he was "too cold" towards her and she had found another boyfriend.

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安西双葉

小日向梢絵

Makie Kohinata (小日向 梢絵 Kohinata Makie) is the mother of Koshiro Saeki and Nanoka Kohinata. Until moving to Tokyo, Nanoka lived with her mother, who runs a hair salon. She rarely sees Koshiro, though she speaks to him fondly when he visits.

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佐伯善三

Zenzo Saeki (佐伯 善三 Saeki Zenzō) is the father of Koshiro Saeki and Nanoka Kohinata who is prone to bouts of hysterical worry and cares for both of his children, though in particularly Nanoka.

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宮内一哉

Kazuya Miyauchi (宮内 和也 Miyauchi Kazuya) is a popular and attractive boy in Nanoka Kohinata's class. He's initially introduced as a possible rival for her affections, but in the manga he has a forbidden love of his own and is infatuated with the school librarian. Unlike Futaba Anzai or Yoko Tamaki, Miyauchi does not tease Nanoka about her "brother complex" and tells her not to take their jokes to heart.

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小田切圭

Kei Odagiri (小田切圭 Odagiri Kei) is the office pervert, who always wants a teenage girl as his significant other, revised after meeting Nanoka Kohinata to wanting a younger teenage sister. He works in the same office as Koshiro Saeki and Kaname Chidori who serves as a contrast to Koshiro and as comic relief.

Bio from Fandom, licensed CC BY-SA