Kazusa is the series main lead. 
Since childhood, she has been in love with Izumi, but all this time she was afraid to take a step forward, while the mockery of more popular classmates did not motivate her to be more active in an attempt to attract his attention. However, as the story progresses, she notices that Izumi is clearly sexually attracted to Sugawara’s outstanding beauty and tenderness. She is Sugawara's friend and is childhood friends with Izumi and Momoko.

The girls in a high school literature club do a little icebreaker to get to know each other: answering the question, "What's one thing you want to do before you die?" One of the girls blurts out, "Sex." Little do they know, the whirlwind unleashed by that word pushes each of these girls, with different backgrounds and personalities, onto their own clumsy, funny, painful, and emotional paths toward adulthood.

**Height:** 164 cm

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Brittney Marie Karbowski is an American voice actress who has voiced in a number of English-language versions of Japanese anime series for ADV Films, Funimation and Sentai Filmworks, most notably, Black Star in Soul Eater. She also voices as Wendy Marvell in Fairy Tail, Mikoto Misaka in A Certain Magical Index and its spinoff, A Certain Scientific Railgun, and Yuri Nakamura in Angel Beats!.

When Kazusa enters high school, she joins the Literature Club, where she leaps from reading innocent fiction to diving into the literary classics. But these novels are a bit more…adult than she was prepared for. Between euphemisms like fresh dewy grass and pork stew, crushing on the boy next door, and knowing you want to do that one thing before you die–discovering your budding sexuality is no easy feat! As if puberty wasn’t awkward enough, the club consists of a brooding writer, the prettiest girl in school, an agreeable comrade, and an outspoken prude. Fumbling over their own discomforts, these five teens get thrown into chaos over three little letters: S…E…X…!
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<i>Note: Includes 2 epilogue chapters and 2 extras.</i>

Kazusa Onodera