TV-Series
Description
Akari Gero is the younger sister of the protagonist, Hikaru Gero, and a member of the Poison Clan, a family of professional assassins. She is depicted as being in a serious romantic relationship with another girl, a fact that puts her at the center of the story's initial conflict. Because the clan's matriarch demands an heir to continue the Poison Clan lineage, Akari is threatened with being forced to bear a child against her will, which would mean leaving her girlfriend. This threat directly motivates Hikaru Gero to abandon his plan to let the family line end with him and instead seek a wife, hoping to shield his sister from this fate.

Personality-wise, Akari is portrayed as a caring and considerate individual, particularly towards her brother. She is aware of the immense pressure and loneliness he endures as the family's heir. Her willingness to sacrifice her own happiness and relationship to bear an heir stems partly from a desire to be of some use to him and to relieve him of the burden he carries alone. She and her girlfriend are depicted as being very affectionate and devoted to each other.

Akari's role in the story is primarily as a catalyst for the main plot. Her predicament is the immediate reason Hikaru begins his quest to find a marriage partner. Though she is less prominent after the first chapter, she remains an important figure in Hikaru's life and motivations, later making a return appearance during the Akakura story arc.

Her key relationships are with her brother, Hikaru, for whom she feels a deep sense of loyalty and protectiveness, and with her unnamed girlfriend, with whom she shares a close and loving bond. Their grandmother, the clan matriarch, views Akari not for her skills but primarily as a means to produce the next generation.

In terms of development, while Hikaru is the one who actively changes his life to find love, Akari's situation evolves from one of passive victimhood to being freed from the clan's expectations. Her brother's success in finding a partner ultimately allows her to live her own life on her own terms. Regarding abilities, as a member of the Poison Clan, she has some training in their craft, but it has been emphasized that she cannot match her brother's skills. Her known talent is specifically in detoxification, but she is generally considered an inadequate inheritor of the family's main techniques.