Takamaru was a student at Ten Treasure Academy, succeeding in ordinary school life, looking for romance that was constantly interrupted by Shihoudou Narika (daughter of his apartment manager). One day, he fell in love at first sight with a transfer student named Takamori Haruka. That night, Takamaru and Narika were chased by a group of mysterious ninja. Haruka appeared in a kunoichi outfit. Haruka regards Takamaru as a "young boss", and asks him to do what must be done. This gives super powers that allow him to fight the mysterious ninja. However, this is only the beginning of a very long battle.

악귀가 배회하는 어둠을 베는 정의의 변신 히로인 등장!

밤의 거리에 나타나 사람들을 습격하는 의문의 시노비 집단 '노로이당'. 그 노로이당에 맞서는 한 소녀 '타카모리 하루카'.

주인공 전부 타카마루와 하루카는 정의의 닌자 집단 '가미겐슈'의 일원이었다.

타카마루는 음란한 행위로 인류를 초월한 힘 '음력(淫力)'을 부여하는 능력의 소유자였다.

故事讲述传承百年的正义忍者集团「上弦众」，对抗在现代甦醒，再次危害世界的「诅咒党」（日语：ノロイ党）的故事。继承了同为ALICESOFT作品的《超昂天使Escalayer》的风格，有著「与女主角（女英雄）做爱提供她作战用的能量」、「如果女主角战败会被敌人凌辱」这两个共通点。

Takamaru ist Student an der Ten Treasure Akademie. Er führt ein gewöhnliches Schulleben und ist auf der Suche nach neuen Liebschaften, doch jedes Mal mischt sich Shihoudou Narika, Tochter seines Vermieters, ein. Eines Tages verliebt er sich Hals über Kopf in eine neue Schülerin namens Takamori Haruka. In der selben Nacht noch werden Takamaru und Narika von einer Gruppe mysteriöser Ninjas verfolgt. Gerade als sie denken, sie seien gerettet, erscheint Haruka vor ihnen und das nicht ohne Grund...

Afin de sauver le monde d'un grande menace, Ikusabe Takamaru doit coucher avec deux filles, Haruka et Narika, pour qu'elles puissent se transformer en ninja, et sauver nos vies !