; :The protagonist, he moved to Asagiri Island in order to look for work, having been unemployed since graduating from high school. He is skilled in martial arts, having been trained by the Tsuruga school. He is implied to have trained under Ami Tsuruga, a character from Seo's previous series
The Café Terrace and Its Goddesses. ; :A high school student and a resident of Umine Inn. She is cold towards Kazuma when they first meet, but she quickly changes after he saves her from an encounter. She is interested in finding treasure on the island told to her by her late grandfather, and wants Kazuma's help in finding it. ; :A resident of Umine Inn, who currently works as a
hostess. ; :A 21-year-resident of Umine Inn, who moved to Asagiri Island to take over her late grandfather's
sake business, turning it into a
shōchū distillery. She previously worked at a factory in Tokyo. ; :A girl who moves into Umine Inn. She met Kazuma a year prior to the start of the story, after he rescued her while he was training in the mountains. She is secretly a
kunoichi and arrived in the island after her family tasked her with killing Kazuma; however, as she has developed feelings for him, she is unable to push through. ; :Kazuma's aunt, who runs Umine Inn. She is his mother's younger sister. ; :Kazuma's cousin and Aya's daughter. ==Publication==