Futami is known for being intelligent at her school, but her curiosity often leads her to take risks, such as turning in blank tests. when she received a 0 on one of these tests, she decided to throw a paper airplane out the window of the science room to see how far it would go. this action started a chain of events that ultimately changed her perspective. another student at the school, kazuki aihara, found the paper airplane and returned it to futami along with her test paper. in an attempt to further her understanding of love, futami decided to conduct an experiment on kazuki by kissing him. her experiments involved holding hands, kissing, and staring into each other's eyes to see if she could determine whether or not she had a sense of taste.