RDG Red Data Girl 4 (Kadokawa Bunko)

[Machine Translation] At the end of the summer vacation, Sensuiko returns to Houjou Gakuen and suddenly feels something strange at the main gate, but she forgets about it as she is busy preparing for the school festival as an executive member of the student council. The theme of this year's festival is "Sengoku Gakuensai" (Sengoku School Festival). Sensuiko is suddenly assigned to be a model in a costume dressing class, but Fukayuki is afraid of Himegami's appearance. After the event, Sensuiko changes into her school uniform, but it turns out that she is not Himegami himself... The story finally reaches its climax. This is the fourth volume of the RDG series.

夏休みの終わり、鳳城学園に戻った泉水子は、正門でふと違和感を覚えるが、生徒会執行部として学園祭の準備に追われ、忘れてしまう。今年のテーマは「戦国学園祭」。衣装の着付け講習会で急遽、モデルを務めることになった泉水子に対し、姫神の出現を恐れる深行。果たして終了後、制服に着替えた泉水子はやはり本人ではなく...。物語はいよいよクライマックスへ。姫神から語られる驚くべき事実とは。RDGシリーズ第4巻。