【PC】ヒメゴト・マスカレイド～お嬢様たちの戯れ～

記憶喪失で天涯孤独というファンタジーに加え、女性恐怖症まで患う男の子・静鳴樹 （しずなり いつき）。

代々良家に仕えてきた静鳴家の養子である樹は、女性恐怖症による失敗から、その克服のため女学園への転入を告げられる。

かくして樹は有数のミッション系超お嬢さま学園 『聖ティフェレス女学園』に、女装して 白羽依月 （しらはね いつき）となり潜り込んだ。

だが、平穏無事な暮らしを望むが叶うわけもなく、早々に男であることを知られてしまう。

相手は “マリアさま” と通称される模範学生、理事長代理も務め学園を動かすカリスマ・比良坂愛璃 （ひらさか えり）。

正体を知られると同時に依月も愛璃の秘密を知ってしまい、互いの秘密を隠し、協力して学園生活を過ごすという契約を交わすことに。

契約では愛璃は、女性恐怖症克服に協力してくれるというのだが……

「私、比良坂愛璃は、貴方に “身体” を差し出すわ」

それは実際に女性、愛璃に触れて慣れていくというハード＆淫靡で、目立つくせに人には見せられない方法だった！

平穏の崩壊は止まらず、マリアさまを独り占めするよそ者として羨望や嫉妬、注目の的になってしまう依月。

学園を敵に回し絶望する依月に、しかし手を差し伸べる愛璃とは別の女の子がいた。

彼女は風紀組織 『聖堂騎士団』の長であり、“アーサー” と通称され唯一マリアさまに対抗できる存在・御剣麻耶 （みつるぎ まや）。

「大丈夫、私が依月さんを守ってみせる」

愛璃と麻耶、ふたりのカリスマの争いは、やがて学園を二分しての依月争奪戦へと発展していく。

最も注目される人物となった依月は、無事に目的を達成して学園を出ることが出来るのか。

Shizunari Itsuki doesn’t have any relatives, lost his memories and even has a fear of women. In order to overcome this fear, which was causing problems in his adopted family, he was enrolled into the Saint Tiphereth Girl’s School as a girl under the assumed name Shirahane Itsuki. However, any hopes he had of an uneventful school life were destroyed when model student and star of the school Hirasaka Eri, known as the "Holy Mary", found out his secret. Luckily for him, he also discovered her true nature in turn, and so they agreed to a mutually beneficial partnership. They would not reveal each other's secrets and would support one another to the best of their ability. And in order to help him get rid of his gynophobia...

"I, Hirasaka Eri, offer you my body."

She would help him get used to seeing and touching a woman's body, but it was yet another secret that nobody could find out.

Yet his problems didn't stop there. With him and the famous "Holy Mary" spending so much time together, it was only natural that other girls in the school became jealous of their close relationship. He soon had many enemies, but then another girl vowed to protect him. That girl was Mitsurugi Maya, who was known as "Arthur", and was the head of the school's disciplinary committee, The Chivalric Order of the Church. She was the only one at the school considered a rival to Eri in terms of popularity.

"Don't worry, Itsuki, I will keep you safe!"

With Eri and Maya competing over him in a war of charisma, the school itself split into two factions, and all eyes on him, will it be possible for Itsuki to achieve the goal he came for?