Wears her hair in a side ponytail. Midori's twin sister and has a sister complex. First person: I (polite). She gives off a mature impression to those around her. She always speaks in polite language (keigo) and is a calculating, cunning girl. She never shows her weak side to anyone but Midori and wants to keep her sister complex a complete secret. Because of this, at school, she acts normal, calls her sister "Onee-san" (Sister) politely, and tries to avoid interacting with her as much as possible, though she is actually struggling to hold back (to prevent her true self from slipping out). At school, she suppresses the urge to say "Onee-chan" and says "Onee-san" instead. At home, she calls her "Onee-chan," speaks casually, and is constantly clingy. She panics whenever her sister complex is about to be exposed. She ranks first in her grade on almost every test. She has a high beauty rating. However, she lacks physical strength and athletic ability. To maintain her perfection in public, she behaves amiably toward everyone. A 16-year-old high school student, 160cm tall, with a large chest. She often commits sexual harassment, such as rubbing Midori's breasts. When rejected by her sister, she loses her composure slightly, and her acting becomes clumsy. She tries not to show her weaknesses to anyone, even her sister. She was a crybaby and weak as a child, but now she covers that up by acting tough. She is quite jealous; when she gets jealous, her mental age drops and she pouts. A high-maintenance girl. She values her sister above herself. Her IQ drops whenever her sister teases her. She is a bit of a tsundere toward anyone other than her sister. She hasn't had deep relationships with anyone else since childhood. She doesn't even realize herself that she's actually a little lonely. When embarrassed or stubborn, she unconsciously says very stupid things. She is scary when angry, but ultimately can't win against her sister. She handles everything perfectly as if it were natural (except sports), but she actually puts in an incredible amount of effort behind the scenes. She acts tough and never mentions it, but Midori actually knows.

A girl with a ponytail and a prominent cowlick. An airheaded girl who overreacts. She often plays the fool (boke) and loves being the one who gets teased or corrected (tsukkomi). She doesn't do romance and has never experienced it, so she is oblivious. She has high communication skills and is good at closing the distance with others appropriately. She is bad at studying and a bit of an idiot, but since she never causes trouble for others, she is well-liked. She fools around when it's time to play, but can be serious when necessary. She is good at reading the room; if the atmosphere turns sour, she desperately tries to fix it, and she changes her behavior based on the mood, making her very considerate. She has a cute, puppy-like way of speaking, often ending sentences with "-dayo!" Also a 16-year-old high school student, 154cm tall. She is afraid of being disliked. Therefore, she always reads the room and is considerate of those around her. Her mental age is surprisingly high. She is straightforward and bad at lying. Everything shows on her face. Despite having no athletic ability, she has plenty of stamina and energy. She is bad at being scolded and also bad at getting angry at others. She can adjust her sense of distance depending on the person and is good at being attentive. She is quite well-mannered, so she never visits someone's house without an appointment.