Yumi Sorairo is the youngest sister out of the three. She is very girly and friendly, otherwise she can be a little childish with her sisters come out some unique abilities.
Akemi Sorairo is the middle sister. However, she acts a bit more mature and smarter than Yumi. She is very calculated and seems to be good at puzzles.
Sumi Sorairo is the oldest of the three. Sumi is the most mature girl who likes to take care of her sisters. Yumi describes her that she is "acceptable and agreeable, very intelligent, eloquent, and wise".