Mitsuki Kawai

She is the younger twin sister. Being a polar opposite of Kasumi in terms of personality, she is quite dumb, excels in sports, innocent, and sincere. She is interested in romance despite being unfamiliar with it and shy about it. She hates studying and she carries out her troublesome schemes to drive their home tutors out. She is also a crafty girl who maintains her grades by using any insider information Kasumi obtains.