Three men and women who have been close since their nursing student days, two of whom are in a relationship and living together. They became working adults and nurses. The two girls openly declare themselves as best friends, and they work at the same hospital. One day, a woman named れいか stays over at the couple's apartment. As they reminisce about old times and drink alcohol together that night, words from her mouth begin to disrupt the man's reason and instincts...
