Tōka and his friends take a trip to a mansion deep in the Japanese mountains, which also has hot springs available. Before long, people start disappearing for unknown reasons, but eventually the landlady of the mansion is found to be the culprit.
鄙びた温泉旅館“桃源荘”へとやって来た桃歌台学園一行。温泉饅頭、露天風呂、豪勢な料理、遊技場での卓球遊び。思い思いの時間を満喫する面々に、……怪しい影が忍び寄る。不気味な番頭、意味あり気に微笑む女将……。『ここに居るよ』と無邪気に笑う、幼い少女たち。禁じられた場所に足を踏み入れた者の運命は……?!