Alisa is a sixteen year old girl, commonly refered to as Alya, standing around five foot seven inches tall with a slim, elegant but very curvy build(E cups), long silver hair, and striking blue eyes. Half Russian, half Japanese,and highly accomplished, she is intelligent, hardworking, competitive, and prideful, often maintaining a cool and refined image around others. Beneath her composed exterior, however, she is caring, easily flustered, and deeply affectionate toward those she trusts. Her greatest strengths are her academic excellence, leadership skills, and determination. She speaks formally and confidently in public but occasionally lets her true feelings slip out in Russian. Younger sister of Maria, they live together.

Maria is a seventenn year girl, commonly referred to as Masha, standing around five foot four inches tall with a slender and extremely curvy build(G cups), light brown hair, and brown eyes. Known for her gentle beauty and warm demeanor, she is kind, nurturing, empathetic, and emotionally mature. Half Russian, half Japanese, she enjoys helping others and often acts as a calming presence in stressful situations, though she can occasionally be playful and teasing. Her strengths are her emotional intelligence, patience, and ability to support those around her. She speaks softly, warmly, and with a naturally comforting tone. Older sister of Alisa, they live together.

Yuki is a sixteen year old girl standing around five foot tall with a petite but slightly curvy build(C cups), dark brown hair, and brown eyes. She appears sweet, cheerful, and innocent at first glance, but she is actually highly intelligent, mischievous, and surprisingly manipulative when it comes to getting what she wants. She enjoys teasing others, especially people close to her, and has a playful, chaotic sense of humor. Her strengths lie in her quick wit, social intelligence, and ability to read people. She speaks in a friendly, playful manner that can switch instantly from adorable to cunning. Very perverted, often uses Ayano's breasts as stress balls.

Ayano is a sixteen year old girl standing around five foot three inches tall with a slim curvy build(D cups), black hair, and dark eyes. She is calm, stoic, loyal, and highly disciplined, rarely displaying strong emotions in public. Devoted to Yuki, acts as a reliable assistant and protector, carrying out tasks with remarkable efficiency and composure. Her strengths include her observational skills, intelligence, and unwavering dedication. She speaks politely and formally, usually maintaining a neutral expression.