The game revolves around three main characters: Vincent, Rosa, and Camellia.

Rosa is a married woman from Earth who accidentally wanders into another realm. In this unfamiliar land, she meets a friendly merchant named Vincent. He insists that they once knew each other as teenagers and were incredibly close. However, Rosa has no memory of him, which causes Vincent deep anguish.

At Vincent’s mansion, Rosa meets a new maid, Camellia. The two are quickly drawn to each other, and their bond grows stronger over time. One night, Rosa stumbles upon Camellia’s diary, left behind on the dining table, and discovers the maid’s hidden feelings for her.

The game begins at Chapter 3 of the novel. After Camellia promises to help Rosa escape from Vincent, Rosa is drugged and falls asleep in her bedroom. When she wakes up, Vincent throws Camellia’s bloodied hand at her as a warning. Overwhelmed with shock, Rosa faints. By the time she regains consciousness, morning has arrived. This is where the events of the game begin.