Saya Akabane

Belonging to Class 3-D, this elder sister of Aya presents a deceptively sweet and gentle exterior. In reality, she is a notorious, sadistic delinquent who frequently teams up with the equally ruthless school nurse, Oku Kaname. Their close, potentially romantic bond often leads them to target Aya for teasing, creating a recurring comedic dynamic where Aya lives in constant fear of the duo's unpredictable and playful cruelty.