Yuna Hiiragi and her sister Ayaka Hiiragi have been protecting the Yugahara Inn, which boasts over 100 years of history. The town where the inn is located is quiet but peaceful, and Yuna enjoys her student life with her childhood friend Hina Kasuga and transfer student Yotsuba Kimino. Meanwhile, during summer vacation, an unexpected event occurs that pours cold water on their lives. It is discovered that the inn's manager has borrowed a large amount of money using the inn's title deed as collateral. The manager disappears, and instead, some suspicious men and a mysterious beauty, Mari Fujimoto, arrive. The title deed was in their hands without the sisters' knowledge. The Hiiragi sisters try to get the inn back, but the men make a proposal to them. If they continue to run the inn according to their instructions, they will not be fired. They have no choice but to accept the conditions, and for the time being, the situation seems to have settled down. However, one day, their sister Ayaka collapses from mysterious overwork. Eventually, Yuna learns the reason behind her sister's overwork and realizes that their words were a sweet trap... [From Getchu]