Erika Shinohara (篠原 エリカ Shinohara Erika) is the main protagonist of the series. She was a high school student who lied to her friends that she had a boyfriend and claimed that the person in the photo was her boyfriend, but that person turned out to be Kyouya Sada, who was a student at the school. Later in the series, she develops some feelings for him, which are later reciprocated. Erika met Elly and Uka there, Kyouya was also there in the series.
In Volume 16 Chapter 58 and Volume 16 Chapter 58.5, she is now Kyouya's wife (she now becomes Sata Erika) and becomes Yuna Sata's mother.
Erika is an attractive girl with sleek, shoulder-length dark brown hair that is sometimes accessorized, large, sparkling brown eyes similar to a deer's, and a slender, petite figure.
Like the other characters, she usually wears a school uniform, which consists of a white shirt, a yellow vest, a red and white bow on the collar, a turquoise pleated skirt, navy blue knee-length socks, and brown loafers. Erika loves pretty things, and her casual outfits are usually very feminine.
Erika has changed her hairstyle in the anime and manga:
In Episode 10, she cuts her hair into a bob.
In Volume 16, Chapter 58 and Volume 16, Chapter 58.5, she cuts her hair into a neck-length bob and wears it in a small ponytail, looking mature and motherly.
Erika is usually seen as a laid-back girl, but as Kyoya Sada said, she is easily fooled. She also has a strong determination and self-confidence, but she does not dare to show it in front of her boyfriend. Ayumi Mita (Erika's best friend) tells her that she agreed to become Kyouya's dog in exchange for him pretending to be her boyfriend, whom she also calls a "masochist". Erika has a habit of bragging, which often comes back to haunt her. He is also a glutton, a person who can eat a lot of things.
Erika is nicknamed "Wolf Girl" for her habit of lying, which is a reference to the popular story "The Boy Who Cried Wolf".
Ayumi Mita points out that Erika is a masochist (a person who gets sexual satisfaction from their own pain or humiliation).