Ichika Nakano stands as the eldest quintuplet sister. Her cropped hair features a signature long lock on the right side, often paired with a distinctive earring signifying her firstborn status. She possesses a well-endowed figure and frequently wears her school uniform with a jacket tied around her waist, sometimes leaving the top unbuttoned. She begins with academic skepticism, acting as an obstacle to tutoring, but evolves significantly. Her dedication to studying intensifies alongside her pursuit of an acting career, leading her to balance schoolwork with professional commitments. She diligently studies during filming breaks and late nights, earning recognition for managing both responsibilities. As the eldest, Ichika embodies a maternal role, presenting a calm and approachable demeanor. She refers to herself as "onee-san," encouraging others to confide in her. Yet, beneath this composed exterior lie concealed insecurities and vulnerabilities, particularly concerning relationships and self-worth. A habitual "fake smile" masks her inner struggles, and she receives counsel to abandon this facade. Ichika possesses strong acting abilities, adept at mimicking her sisters' mannerisms, though imperfectly. This skill sometimes facilitates morally ambiguous actions, like disguising herself as Miku to pursue romantic interests. These deceptions spark friction and confrontations with her sisters, leading to eventual reconciliations. Career ambitions occasionally clash with family bonds, as when she contemplates leaving school for acting but ultimately commits to both after encouragement. Her romantic feelings create tension within the sisterhood. She experiences jealousy and competitiveness, confessing a private desire to maintain the status quo while simultaneously not wanting others to "have" the object of her affection. In romantic contexts, she exhibits a playful yet insecure side, blushing easily during intimate moments. Later, including post-marriage events involving her sisters, Ichika joins a honeymoon trip to Hawaii. There, she assists a local girl named Lily, leveraging her acting experience to offer romantic advice despite language barriers. Professional challenges arise, such as physical demands for a role and public recognition during the trip, which she confronts directly. Her career culminates in success as a renowned actress, reflecting her perseverance. Ichika displays sharp emotional insight, accurately deducing interpersonal conflicts and understanding others' states. She values her sisters' cohesion but gradually learns to prioritize individual growth alongside collective support. Her character arc emphasizes balancing personal ambitions with familial loyalty while navigating complex emotional landscapes.