橘 アルテミシア

Occupation: A teacher at Tachibana Gakuen, the leader of the "Tachiagare Imouto (Raise Up, Little Sisters!)" party
Hobbies: Gaming, eating, sleeping
Skills: Languages, can sleep anywhere

The 366th little sister who was appointed as a teacher. Despite being a genius who has graduated from a medical university outseas, Artemisia is very sloppy and doesn't know how to take care of herself, and hates studying. She came to Japan so she could meet her brother and sisters; at the same time, she thought her life would become easier.