Amemiya Hotaru has just returned to Tokyo after having worked three years in Hong Kong on a company project. Despite not having contacted Takano Seiichii, her boss and roommate, during this time, she returns expecting things to have stayed the same. However, Hotaru is on for a shock as Seiichii proposes to her. Ecstatic, Hotaru agrees, however upon meeting Seiichii's university friend, Konatsu, Hotaru comes to realize how mismatched the two of them are. Despite appearances at work, at home she's lazy, messy and doesn't know how to save, while he's clean, cool and thrifty. In an attempt to become more like a woman who matches Seiichii, she becomes determined to change her ways. However, things become complicated with the arrival of Seno Kazuma, a new contract employee at her company who seems to accept Hotaru for who she is. Will Seiichii and Hotaru get their happily ever after or are their differences too big?