Mari is a rebellious and adventurous older sister who found herself entangled in the wrong crowd after high school. Despite her involvement with the mafia, she exudes a charming and playful demeanor, capable of striking a cute pose even in the midst of turmoil. Her actions may have led to her disownment and banishment from her parents' house, but Mari remains resilient and resourceful, seeking refuge and solace with her younger sibling.