Kashima is a caring colleague who always covers for Oishi's frequent mistakes. Having known him even before joining the company, she secretly harbors romantic feelings for him. One day, during a dinner with a client, Oishi gets completely drunk after shielding her, forcing Kashima to nurse him back at a hotel. There, it's revealed that Oishi remembers an incident from before they joined the company, sending their relationship into unexpected new territory...!