Description
Ishu Benikawa commands the international postal airship *Zanbani* as its captain. She stands tall with dark hair, often secured in a ponytail by a yellow ribbon, and green eyes. Her typical attire includes a lavender crop-top featuring translucent sleeves, a red sash worn over black shorts, and tall brown boots; she sometimes adds a long green jacket. She wears glasses, once attributing this to her age.

Her personality combines strong will and independence with a pronounced tendency toward anger. She physically disciplines her crew through slapping or hitting when judging their actions irresponsible, yet demonstrates underlying care for them. Ishu copes with stress through drinking and smoking, and allocates significant personal funds toward acquiring weapons and ammunition.

Five years prior to the main events, after Ahm intervened to prevent Nakiami and Raigyo Tsunomata from petrifying, Ishu reacted with intense anger toward Nakiami, repeatedly slapping her. Despite this outburst, she permitted Raigyo to remain aboard the *Zanbani* for three years before his departure to travel independently.

During operations, Ishu maintains absolute command aboard her vessel. She identified over twenty government inquiry ships via binoculars and ordered Ahm to check radar systems. Receiving no response to hails, she directed the *Zanbani* to dock and instructed Akushiba to wake Nakiami for reconnaissance. Ishu explicitly forbade Nakiami from approaching Sentan Island, an order Nakiami disobeyed. Ishu later waited impatiently at Sentan Island's docks for Nakiami's return, showing visible relief upon her arrival before threatening to jettison Akushiba to reduce weight.

She critically engaged Nakiami's request to harbor Akiyuki Takehara, warning he would inevitably petrify. When Akiyuki demanded transport back to Sentan Island, she refused, citing his ingratitude toward Nakiami for saving his life. This refusal provoked Akiyuki's transformation, attracting a Humanform attack. Ishu retrieved a rocket launcher, proceeded to the deck, and destroyed the Humanform after Nakiami secured Akiyuki's safety.

Ishu's relationship with Nakiami remains contentious, marked by verbal insults like "bitch" or "attention whore" and physical aggression. However, Ishu displays remorse following such incidents, resorting to alcohol and smoking to manage guilt, indicating a complex, albeit strained, dynamic between them.