|Alias||Nisemono (Fan Name)|
B-ko (B子) is one of the main characters of the story.
- B-ko has short, brown hair and purple eyes. On the left side of her hair, she wears a red ribbon. In addition, she is the smallest of the four main characters.
- B-ko is said to be the most popular and beautiful girl in the school the characters are attending, excelling in both her studies and sports. Although she appears nice, cute and cheerful to most people, she has a hidden, aggressive side, that only her three friends seem to know.
- When playing Kokkuri-san, it is revealed that B-ko has someone she likes. Later is revealed that her crush is A-ya.
- She is Amino's (the manga artist's) favorite character in the series.
- "It's all a dream... It's a prank... a lie... It's a superstition." - Unknown Source
- "...Yes... I am perfect. A perfect 'impostor'." - Chapter 5