Tomoko originates as a fabricated identity crafted by Tomoki Sakurai through a transformation device, enabling him to infiltrate female spaces as an unassuming, timid girl. Her appearance—medium-length dark hair adorned with clips, brown eyes, and delicate features mirroring Tomoki’s mother—complements a clumsy, airheaded demeanor that masks his true personality. In Chapter 43, a physical and psychological rift severs Tomoko from Tomoki, granting her independence. Now a distinct entity, she embodies shyness and emotional fragility, often overwhelmed by tears when facing misunderstandings or stress. Yearning for connection, she tentatively seeks friendships at school, though social anxiety stifles these efforts. Her romantic inclinations split between a pure admiration for Sugata and volatile, visceral attractions to women, triggered by touch or provocative stimuli. Identity confusion plagues Tomoko post-separation. Initially compliant with merging back into Tomoki, she rebels upon discovering autonomy and burgeoning romantic desires. Angeloids like Ikaros exploit her vulnerability, weaponizing arousal to coerce reunification—a manipulation that sporadically ignites lewd impulses she vehemently rejects when unprovoked. Tomoki’s persistent gaslighting, insisting she is merely his male disguise, fuels resentment. Their strained dynamic peaks in her tearful defiance, rejecting his claims. Despite this, external pressures or manipulated states force temporary mergers, sparking chaotic or comedic entanglements with others. Her status remains unresolved by the story’s end, hovering between fusion and independence. Physically, Tomoko stands 157 cm with a slender 43 kg frame. Post-split, her abilities mirror human limitations, though she retains voluntary fusion with Tomoki. Her journey navigates the tension between self-determination and external expectations, probing the fluidity of identity, gendered existence, and the clash between societal norms and inner longings.