Souta Minori, an ordinary high school boy, rides the train with a beautiful girl from another school, Nagi Shinonome, nicknamed the "Ice Princess” for her cold and off-putting attitude One day, Souta notices her being molested on the train, and he summons up his courage to intervene and rescue her. The next day, she comes up to him again and asks him....... "Can you stay by my side… while we're on the train." After she told him that she has no other friends to rely on, Sota accepts the request, and he becomes her first “friend.” "I figured that Minori-kun would be my best choice." Now the "Ice Princess" has one person in the world who she acts sweetly, while being cold to everyone else. Can Sota continue to be her “friend”? (Source: Kadokawa, translated)