KissXSis — Characters & Cast

Initially motivated by a desire to study peacefully and pass his exams, his focus evolves into maintaining the happiness of his reconstructed family without breaking their unique equilibrium.

Begins as an exasperated teenager overwhelmed by his sisters' aggression, caught between societal shame and instinctual attraction. Across the series, he learns to acknowledge his own genuine feelings for them, taking charge of his academic destiny to remain at their side.

Strives to be seen as a mature, desirable woman and caretaker worthy of Keita's romantic devotion while maintaining her pride.

Starts as the ostensibly composed, domestic elder sister whose prim facade easily shatters into tearful jealousy and intense yearning. Her journey exposes the vulnerabilities hiding behind her dutiful student exterior.

Seeks to break through Keita's inhibitions through direct physical affection, ensuring he never slips away from their tight-knit bond.

Demonstrates brazen forwardness from the beginning, exhibiting an athletic, uninhibited attitude toward physical intimacy. As the emotional stakes heighten, her casual exterior gives way to genuine selflessness and poignant vulnerability.

Initially aims to uphold school rules and protect her own dignity, eventually developing genuine curiosity and attraction toward Keita.

Transitions from an accidental witness disgusted by Keita's family dynamics into an unwitting participant whose awkward encounters draw her inexorably into his romantic orbit.

Driven to enforce traditional school discipline and prevent inappropriate student relationships, masking her personal romantic isolation.

Serves as the high school teacher constantly surveilling the Suminoe siblings. Her vigilant moral crusade causes comedic collateral damage, revealing her own unresolved romantic frustrations and eccentric domestic incompetence.