Koino and Reina met while working part-time in their student days. Now that they are working adults, they work in different places and share a room. They are both proactive in relationships with the opposite sex and have no romantic feelings between women. But one day, Koino's love life and work life aren't going well, and she is left exhausted both physically and mentally. Reina embraces the heartbroken Koino with her gentle and warm friendship. The moment their relationship begins to change is about to arrive!