Inaho Kushiya is a first-year student at Tenbi Academy and a prominent figure within the institution, serving as a member of the Student Council Security Division, which is also known as the inspection division. She is a petite girl, standing 150 centimeters tall, with short, light brown hair typically styled into two ponytails. She has red eyes and a notable figure for her age, holding an A-rank combat rating within the academy's evaluation system.

Inaho presents a cheerful and innocent personality, often appearing somewhat airheaded or oblivious in her daily interactions. She is soft-spoken and maintains a polite manner of speaking to everyone she meets. One of her most defining traits is an immense fondness for sweets; she always keeps a stockpile of snacks and can devour entire cakes or other confections in a matter of seconds. Her living situation involves sharing a room with her friends and fellow protagonists, Kodama Himegami and Haruko Amaya.

Central to Inaho's character and actions is her deep connection to the main protagonist, Takeru Ooyama. She emphatically refers to herself as Takeru’s fiancee and addresses him with the honorific "sama". This declaration stems from a promise made during their childhood. She originally met Takeru while practicing martial arts alone in the rain. After seeing her injured from training, Takeru struck himself against a tree to make himself like her, and she promised that they would marry when they grew up so they could be together forever. However, Takeru himself does not remember this event well, a fact that causes Inaho distress but does not deter her dedication. She is intensely focused on helping and spending time with him, and is willing to protect him at all costs when danger approaches.

Her background reveals a more complex history. Inaho was an abandoned child left on the doorstep of Tesshin Kushiya, who became her adoptive father and taught her martial arts. She was later captured alongside Tesshin and subsequently left in the care of the Ooyama family, including Atsuma and Takeshi Ooyama, where she grew up essentially as the only child in the household after Takeru left home. This history ties her closely to Takeru's family legacy, particularly concerning her Maken.

Inaho possesses a powerful Maken (a magical weapon) known as Kamudo, which takes the form of a gauntlet. Unlike many students who receive their Maken upon entering Tenby Academy, Inaho already possessed Kamudo prior to enrollment. This Maken originally belonged to the Ooyama family, passed down as an heirloom, and was meant to be inherited by Takeru. However, due to its tendency to run amok, Inaho took over its legacy instead. The primary ability of Kamudo is to greatly multiply the user's physical capabilities, enhancing both strength and speed. Its true, more advanced power is the compression of time and space, allowing the wielder to move freely within a frozen world where everything else appears still. Inaho has not fully adapted to this weapon and struggles to control its immense power; overusing it places significant stress on her body, often causing her to collapse after unleashing a technique such as her attack "Mitsuka".

Inaho maintains several key relationships beyond her bond with Takeru. She shares a friendly rivalry with Haruko Amaya, who also holds romantic feelings for Takeru, though they remain good friends and support one another. She is close friends with Kodama Himegami and Shiria Ootsuka, viewing them as both friends and rivals for Takeru's affection, while respecting them greatly. She also has a beloved pet cat named Monji, whom she met at Tenbi Academy and is often seen carrying on her head. Her relationship with her adoptive father is complicated, as Takeru initially views Tesshin as his mother’s enemy, but Inaho holds him in high regard, a fact that has led to emotional conflict with Takeru in the past.