She is a teacher and a club adviser of the Food Research Club, she is such a drunkard that she keeps her own beer keg in the club and would often drop by to have a mug or two. Though she is Satsuki's elder sister, she never gets any respect from her.   ~!It is later reveled that she and Satsuki are actually half-sisters. *She initially believed she was the daughter of her father's first wife, but she later discovers that she is in fact the illegitimate daughter of her father's then-mistress. Her father's first wife later dies and he marries his mistress, who later gives birth to Satsuki. Upon realizing this, Hazuki became depressed and left the family.  It is also revealed that Yuki would sometimes drop by to cook and have meal with her, because she is quite a bad cook. It is also suggested that she has feelings for Yuki, but it is not known as to how deep her feelings are for him. !~  (Source: Wikipedia)

In Japan, participation in extra-curricular activities is as fundamental a part of an education as chalk and gym shorts. However, not all students are overachievers, and for those like Yuki Ojima, groups like the Food Research Club are welcome havens in which to slack-off. But what's a slacker to do when the radical new candidate for Student Council president announces her intent to get rid of clubs like the FRC? Well, getting the help of the current Student Council president is a good start, but HIS suggestion is so counter-intuitive that it's crazy: Yuki should run for the Student Council himself? And yet, it's SO crazy that it just might work! Especially when Chisato, the chocolate-adverse president of the FRC (and Yuki's best childhood friend,) and members of other targeted school clubs start to join the swelling FRC army. But can this army of goofs and goof-offs coast all the way to political victory? Or will someone have to step up to the plate and take one for the term? <br><br>
(Source: Sentai Filmworks) 

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Picture drama included with the 1st DVD/BD.

Koi to Senkyo to Chocolate follows the protagonist Yuuki Oojima, who attends Private Takafuji Academy, a large school with over 6,000 students. Yuuki is a member of the food research club, along with seven others, including his childhood friend Chisato Sumiyoshi. The members leisurely spend their time in the club not doing much activities. When the election of the next student council president comes up, the front runner Satsuki Shinonome proposes that clubs that have no merit should be sorted out and abolished. The food research club seeks advice from the current student council president Yakumo Mori, who suggests Yuuki run in the election as an opposing candidate. Yuuki learns about the issues facing the school and decides to run in the election.

Hazuki Shinonome