Aika Takamura

Aika became Kōta's stepsister when their parents remarried. A gyaru-style high schooler, she presents a well-mannered and considerate front in front of her parents, while privately unleashing sharp words and a free-spirited attitude toward Kōta. Though she initially provoked and looked down on him, coming to understand his gentle and upright nature gradually drew the two into a forbidden closeness that transcended their sibling bond.