Mitsuru Sanke attends Hakureiryō Academy as part of the servant-ed class, where his gender and calm temperament set him apart in the female-dominated environment. Standing at 1.61 meters with brown hair, golden eyes, and a youthful face, his grounded demeanor contrasts sharply with classmates like Shingo Todoroki, whose overtly perverse antics disrupt decorum, and Kaoru Daichi, whose cross-dressing flair draws attention. Mitsuru’s quiet stability positions him as an anchoring figure within the group.

Upper-ed students frequently treat him with casual familiarity, allowing informal use of their first names while playfully ribbing him in a manner reserved for a younger sibling. Though he tolerates their teasing without protest, it rarely sparks genuine amusement. His unassuming nature fosters an approachable, non-threatening image, sustaining an easy rapport with these peers despite the absence of romantic undertones.

Within the narrative, Mitsuru functions as a steadying force, his presence tempering the servant-ed class’s eccentric dynamics. His interactions remain rooted in the present, with no elaborated backstory or personal evolution beyond his role as a composed counterbalance to those around him.