Haruka is Setsuna's younger sister. She claims to wish for the MC to die as he "stole Setsuna" from her. Despite her killing intent she is unable to kill anyone as she can't overcome the fear from it.

Dear Sir... I Married a Killer
The profession of a calm and calm wife ... a killer !? But my life with my wife who can't kill her emotions in front of her husband is exciting in many ways ♪ I want to be loved enough to be killed by my bride. Married killer's love comedy!