Kayo Maruta is a supporting character and ex-vice-president of the student council. She is best friends with Mitsuko, who she affectionately calls Micchan. Kayo is one of the few people who dares to talk to Mitsuko casually and lives to see another day; she also is seen at Micchan's side for much of the latter half of the manga. Glasses-senpai talks formally with everybody else. While on the student council at Aihara Academy, Maruta was dedicated and very diligent at making sure people are rule-followers, even chastising Yuzu while it's her first day there. Eventually, the brunette lightens up later on and shows her softer side for Micchan and the readers, as well as the group that went on the summer trip in volume 8. During the extra in volume four of the manga, she reveals her surname and her past position in the council.

Fashionable and friendly Yuzu Aihara is ready to face her brand-new school and find her first love. The only problem? It's an all-girls' school. Determined to make a good impression and lots of friends, Yuzu puts on her best looks—only to wind up in trouble on day-one! After a close encounter by the beautiful yet harsh student council president Mei and having her phone confiscated, Yuzu is losing hope that this will be a perfect high school story. But nothing compares to the shock when she gets home to find out Mei is her brand-new stepsister—who suddenly kisses her! With her heart beating wildly and her emotions a complete mess, Yuzu wonders something: Is she falling for Mei? 
 
Torn between being a good stepsister and dealing with her feelings, Yuzu does everything she can to become close to Mei. But can she melt the ice around Mei's heart and heal the pain she hides? 

(Source: Funimation)

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Yuzuko Aihara, a high school girl whose main interests are fashion, friends and having fun, is about to get a reality check. Due to her mom’s remarriage, Yuzu has transferred to a new, all-girls school that is extremely strict. Her real education is about to begin.
 
From Day One, happy-go-lucky Yuzu makes enemies, namely the beautiful yet stern Student Council President Mei. So what happens when a dejected Yuzu returns home and discovers the shock of her life: that Mei is actually her new step-sister who has come to live with her? Even more surprising, when Mei catches Yuzu off-guard and kisses her out of the blue, what does it all mean?
 
(Source: Seven Seas Entertainment)
 
Note: Includes 9 bonus chapters.