Asuka Katou (加藤 明日香 Katō Asuka) starts as a background character and Tomoko's high school classmate in her second and third year. In Tomoko's third year, she forms a friendship with Tomoko. Her full name is revealed in the third year of high school. Katou initially appears a glamorous and popular girl outside of students who know Tomoko. She has a mother from whom she seems to have inherited her looks, and Chapter 140 reveals that she has an older brother who was in college when she was in middle school. Tomoko first materially interacts with her when Katou notices her staring at her as she sits behind her in her make up mirror. She quickly offers to apply make up to Tomoko's eyes. For her part, Tomoko first derisively wonders if Katou expects to be the "Class Mom." Katou does work to include Tomoko in social activities. She also seems to quietly understand others. For example, she quickly disarms Yoshida's defensiveness by immediately complimenting her on her cute animal bag during the trip to the amusement park. On the train on the way home from that school trip, Tomoko awakens to find that she has been sleeping, and drooling, with her head on Katou's lap. She is mortified, but Katou happily assures her that she did not want to disturb her until her stop. Tomoko inwardly concludes that she is more of a "mom" than "a real mom." In more recent chapters, Tomoko fears that she will offend Katou with her real personality. She is surprised when Katō invites her to visit a college with her. Tomoko struggles to suppress her personality; however, Katou misinterprets this as Tomoko not wishing to be her friend. She confesses that she would like to attend the same college as Tomoko to Tomoko's shock. Deeming herself unworthy, Tomoko openly confesses to Katou that she is a "major pervert (ド変態・dohentai); however, as she confesses some of her inclinations such as "sexually harassing" her friends, Katou calmly asks repeatedly, "anything else?" (Source: watamote.fandom)