Michiru Sonoda attends the same school as the main characters and initially reigns as the most popular girl in her class. This self-perceived status drives her actions when she feels threatened by Nozomi Komine's rising social standing, particularly after Nozomi effortlessly wins a class popularity vote. In retaliation, Michiru devises a scheme to disrupt Nozomi's relationship with Kimio Suga, aiming to seduce Kimio to undermine Nozomi emotionally through calculated efforts to gain his attention and affection. A significant locker room incident, occurring while Kimio was accidentally trapped, results in Michiru injuring her leg. This injury forces her to rely on Kimio for assistance, creating closer proximity she attempts to leverage within her scheme against Nozomi. During this time, Michiru displays vulnerability while maintaining her manipulative intentions. As the narrative progresses, her motivations begin to shift beyond rivalry. Though she initiates romantic overtures toward Kimio solely to distress Nozomi, her continued attention in later segments suggests potential genuine interest emerging, even after ceasing direct antagonism toward Nozomi. This implies a possible transition from feigned to authentic feelings, though her underlying intentions remain complex. Michiru exhibits manipulative behavior, presenting a superficially friendly and charming exterior while concealing vindictive motivations. She strategically employs her social status and perceived charm to influence situations, specifically targeting Kimio to affect Nozomi, contributing to interpersonal conflicts within the school's central dynamic. Visually, Michiru is consistently portrayed with blonde hair as a student, her design aligning with her established role as a popular figure among classmates.