Mina embodies death itself, appearing to claim souls at the end of their lifespans. She identifies as a shinigami, specifically a beautiful and naive young woman newly undertaking this role. Her lineage connects her to supernatural entities as the granddaughter of both Seren Melvil and Shinigami Oyabin.

Physically, she possesses distinctive purple hair reaching her hips and green eyes. Her typical attire consists of thigh-high boots, opera gloves, and a leotard, often accessorized with a scythe and styled in a ponytail.

Her first assignment involves claiming the soul of Takami Akitoshi following his predetermined death. Faced with Akitoshi's sister Hitomi's desperate pleas, Mina exhibits unexpected flexibility. She offers an alternative: sparing Akitoshi's life for ten additional years if he fathers a child within one week. This decision reveals a capacity for mercy stemming from her naivete and inexperience.

Her involvement extends beyond setting the condition. She actively participates in attempts to fulfill the agreement, including coaching Akitoshi on techniques to please Hitomi. Her role evolves further when she engages in a three-way encounter with Akitoshi and Hitomi, aiming to facilitate reconciliation between the siblings and secure Akitoshi's survival. These actions chart a progression from detached enforcer to emotionally invested participant in the human lives she initially sought to judge.

Her relationships primarily center on Akitoshi, the target of her original mission, and Hitomi, whose intervention altered Mina's course. The dynamic shifts from an antagonistic soul reaper and victim relationship towards a collaborative one, driven by the shared goal of meeting the life-extension condition.