Origin
Japan
Ryoko Tachi is a second-year student who goes to the Shiratori all-girls school. She is strong willed and has a bubbly persona. Behind her olive skin and athleticism, she is delicate and outcast by her school peers, her independency is to fault. However, to her friends Nana and Kaoru whom met through the 800m and morning running respectively, she is an honest, cheerful and reckless person. She is often mistaken for a guy, in the meeting with Kaoru on her morning run she was annoyed by this misunderstanding which is proposed to due to her obvious lack of chest and she shows him her modest cleavage as proof for her gender.
Nana and Kaoru
Kaoru is a 17-year-old virgin who has an S&M fetish. He has always dreamt about an SM relationship with his childhood friend Nana, who is looked upon as perfect and is always the target of boys' eyes. Their relationship has somewhat deteriorated through the years, due to them hanging out with different people and because Kaoru is not taking his education too seriously. One day though, Kaoru's mother gives some of his S&M toys to Nana for safekeeping. Nana finds the leather one-piece that Kaoru bought and tries it on but accidentally locks herself in it and doesn't have the key! Kaoru frees her of the one-piece, but then Nana realizes she may like Kaoru's hobby more than she thought. Subsequently, the two of them start engaging in so-called "breathers." These breathers are intended to relieve Nana of stress that originates from her attempts at keeping her grades and name perfect.
