Makabe Aisawa, alternatively called Arisa Makabe, is Haruto Makabe's older sister. She stands out as a popular and academically gifted high school student, celebrated for excelling in numerous pursuits. Her striking blonde hair and uncommon green eyes solidify her widespread recognition as exceptionally beautiful. At school, she projects an effortlessly flawless and relaxed image, adhering to personal standards that occasionally defy regulations, such as maintaining dyed blonde hair.

Within the family home, her demeanor transforms dramatically toward Haruto. She asserts dominance and authority, treating him as a subordinate or servant to enforce her perceived superiority through commands and expected obedience. Privately, their relationship harbors an intimate dimension hidden from outsiders. She initiates playful yet progressively intense suggestive and erotic interactions with Haruto, steering these encounters as the undisputed leader.

Her motivations for escalating this intimacy remain undisclosed, though her actions reflect a deliberate, controlled push against their physical and emotional boundaries. Her character evolves through this shifting dynamic with Haruto, transitioning from household dominance to overt sensual engagement, leaving the consequences of her initiatives unresolved.