Name: Kondou, Mayuka (近藤繭佳)
Alias: Mr. X (ミスターX)
Relationship Status: Single
Origin: Onii-chan no Koto nanka Zenzen Suki Janain Dakarane!
Kondou Mayuka is a model high school student and class president who in contrast to her pristine reputation secretly goes out at night to buy BL magazines. When she accidentally bumps into her classmate Takanashi Shuusuke one evening while the two are on their respective porn runs, she winds up making Takanashi into her “pet,” an errand boy who has to buy BL for her in exchange for food and pats on the head. While she at first she keeps him around by way of threats, the two eventually develop an actual friendship.
Kondou is adept at cooking and studying. Her most noticeable feature is her black pantyhose, to the extent that she singlehandedly induces a black pantyhose fetish in Takanashi. Mayuka has feelings for Takanashi, though they appear to be tied to her fondness for yaoi and wish to see him in equally dire situations. Her alter ego, Mr. X, is her personal name for when she wishes to disguise herself and her fujoshi side.
The reason Mayuka turns Shuusuke into her errand boy is that while she desires more extreme yaoi titles she is too embarrassed to buy them on her own, showing that while her imagination is vast she has limits based in reality.