Kimikage Mogami, a second-year high school student, sports long reddish-purple hair swept into a ponytail with straight-cut bangs framing his face, accentuated by piercing pink eyes. He carries himself with formal poise, conversing in an antiquated dialect and addressing others with "-dono" honorifics, underscoring his traditionalist leanings. His personality harbors a pronounced masochistic streak, particularly directed at Seri Koyuki, whose reprimands he actively solicits—even pleading for harsher punishments after physical altercations. This fixation originates in childhood loyalty forged when Seri defended him from bullies, though Seri recalls their bond as more casual than Kimikage’s deeply intimate perception.

Their shared past includes collaborative moments like playing *ohajiki* and embodying rival roles in a school play—Kimikage as a red oni opposing Seri’s blue oni. A pivotal incident during a urine test saw Seri assist Kimikage after he struggled to produce a sample. Confusing test results later led Kimikage to accuse Seri of substituting dog urine, a claim she denies. His guilt intensified when Seri transferred schools, wrongly blaming himself instead of attributing it to her father’s job relocation.

In high school, Kimikage engineers self-degrading scenarios to capture Seri’s attention, such as hiding on staircases to be trampled. Though Seri remains uneasy, their dynamic lacks the volatility of her interactions with others. Kimikage’s rivalry with Kabuto Hanadori exposes his hypocrisy: he mocks Kabuto’s delusional antics while mirroring his dramatic tactics. Despite this, they temporarily ally to support Seri during stressful periods, revealing pragmatic cooperation beneath their antagonism.

Kimikage frequently shoulders blame for unrelated incidents, his motives—sincere remorse or punishment-seeking—remaining ambiguous. Once a tearful child, he now maintains a grave demeanor punctuated by lingering emotional fragility. His name, derived from "lord" (君) and "shadow" (影), encapsulates his dual nature—outward dignity masking inner vulnerabilities.