It's the 1900s, during the Taisho Era, and Ranko Hanamiya is 24 and working as a server at the posh caf?, Cassiopeia. Her parents tell her they're ashamed of having an unwed daughter, but Ranko herself couldn't care less about it. Then, one day, a ravishing college student she's never met before gives her a present while she's working. Her coworkers are ecstatic, but the rational Ranko doesn't know what to make of it. At home, she's met with another surprise. Apparently, someone from the Chonabashi family wants to marry Ranko! It seems as though their grandfathers made a pact to have their grandchildren marry each other one day. Ranko declines, as she enjoys working and isn't interested in marriage, but her parents won't have it. She rather unwillingly goes to the Chonabashi residence to please her parents and protect their egos. When she gets there, who does she see but Yoichiro, the unfriendly young man who gave her that present at the cafe!