Yuuko Aioi
Yuuko is one of the major roles. She is one of the three trio high school students that the show focuses on majorly. She is a bit of a slacker when it comes to school work and studying. However, she is also very imaginative and often comes up with very crazy scenarios. She is probably the most reactive out of the three, as she is constantly noticing every little detail about something and making assumptions from it. She also really loves jokes, although they often aren't very good.

Yuuko is also probably the most unluckiest character in the show. Nothing ever seems to go her way whatever it may be that she is trying to do. She may get hit in the head by a wooden doll, or by a giant metal bell. It is thought that she is still wondering what a Doppio is to this day. She is very competitive and never likes to lose at a game she likes to play, although she is the most playful out of the trio schoolgirls.