The main character Tomoyuki Nakayama is an ordinary young man with a boring appearance and withdrawn character. He has a cute, but bold and bossy younger sister Mika, who is a member of the student council and in addition is an excellent student. Against her background, of course, he merges with the shadow. So the hero befriends his neighbor and classmate Sasai Ono. She is smart and beautiful, as well as the president of the student council. She is very bossy towards Tomo and often tweets him, as she treats Mika as her own sister. Soon the hero receives a mysterious hypnosis application on his phone, which is able to enhance the sexual desires of the subject. Tomoyuki decides to test the application on Mika and Sasai....

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