Atsushi and Yurika are coworkers and former classmates who have a fiery relationship due to their completely opposite personalities. Atsushi is laid-back and stubborn, while Yurika is assertive and hot-tempered, leading to frequent arguments. Atsushi always ends up apologizing quickly, but as time passes, he begins to stand his ground even over small matters, causing their relationship to deteriorate both personally and at work. Then one day, Yurika secretly goes out drinking with a colleague without telling Atsushi...!