Shūji Majima, alternatively spelled Shuuji Mashima, is an adult salaryman employed as a consultant with primary assignments abroad. He has remained without a girlfriend for seven years and harbors nearly complete disinterest in women. This detachment surfaces during a dating party when he declares, "I'm not into women," provoking initial disgust from protagonist Mio Sudou. However, Mio's subsequent provocative response triggers an unexpected shift in their dynamic, marking a pivotal turning point in their relationship.