Senju Kawaragi/Synopsis

History
Senju is the youngest among the Akashi children known as the "Mysterious 3 Siblings.” Her eldest brother Takeomi Akashi was a founding member and Vice President of the first-generation Black Dragon before joining Brahman, while her second eldest brother Haruchiyo was the former Vice Captain of the 5th Division in Tokyo Manji Gang. Currently, Haruchiyo is a trusted member of the Kanto Manji Gang under the leadership of Manjiro Sano.

While not much information is given about her family, Senju prides herself on having a close relationship with Takeomi. On the other hand, Haruchiyo finds no interest in her and Brahman despite Takeomi’s endorsements. During a day-off shopping spree with Takemichi Hanagaki, she mentions how Haruchiyo’s detachment from his siblings is what led him to join the Kanto Manji Gang.

She uses a fictitious surname “Kawaragi” instead of her factual surname to stay professional in the workplace. However, her true reasons for doing so, as well as her family history, remain unknown.

Three Deities arc
Senju was powerful enough to emerge from the vicious Tokyo's Sengoku Period that occurred after Toman's disbandment as one of the three main victors with her gang, Brahman. At some point in the story, she stated that Brahman's goal was to defeat Manjiro Sano and his gang.

Senju opted to hid within her gang as they was confronting Rokuhara Tandai and a few former Toman members. As her right-hand man, Takeomi Akashi, remarked how nice it was to be young, Senju surprised everyone throwing her umbrella at South Terano. Terano swatted it aside, which Senju intended, and she used the opening to leapt into the air and launched a heavy axe kick on Terano's head.

Senju beckoned to Takemichi for her umbrella, to which the latter hurriedly picked it up for her. Senju then fearlessly looked up at Terano. Shion Madarame challenged Senju, but he had no idea who she is. Senju was watching as Benkei knocked out Shion and expressionlessly responded to Benkei's admonishment.