Little Brother & Sister Complex

She is a wallflower, cold and oblivious. She never really care about what would people think and feel about her. She doesn't really like being a center of attention, she never really get along with her classmate moreover a girl. Girls tend to judge her as someone with a dark personality. She only care about one person, her special and precious little brother Akiara Haru. Her obsession toward her little brother is something that people called as "brother complex"

He is a popular guy with a charismatic persona, no guys nor girl who didn't know his name. Whenever he goes people will quickly acknowledge him due to his very attractive face. But he kinda cold and never give a damn with people who always tried to surrounding him except his one precious little sister, Sato Momoka. His possesive he has for his sister is something that people called as "Sister Complex"

Akiara Reina and Sato Kyousuke is a classmate who never get along well, they even never care about each other existence but what would happened if they accidentally find out that their precious little brother and little sister is secretly dating behind their back?