The plot of the story should consist of the below information: 

The protagonist, NAME_1, is a silver-haired, dark blue-eyed middle school student who happens to be the biological younger sister of NAME_2, a brown-haired, red-eyed ordinary male high school student. The siblings' parents are High-Class-Devils, leading normal lives in the human world. NAME_3 takes up the art of kenjutsu to honor her family's legacy and protect her older brother from rouge devils and other supernatural creatures lurking in the human world. When NAME_4 becomes the Lover's candidate in the competition to become the Devil King, NAME_3 decides to assist him from the shadows. She is thrilled to discover that she has been chosen as his "knight" by the Lovers Arcana. Although NAME_3 conceals her identity from her classmates at Ginsei Academy, she must eventually reveal the truth to NAME_4's "queen" and "princess", the beautiful black-haired, blue-eyed college student NAME_5 and the carefree and easygoing, blonde-haired and blue-eyed second-year female high school student and NAME_6.

NAME_7 and NAME_8, who are both beautiful and possess quite large bosoms, meet NAME_3 in the NAME_9 family's luxurious suite in Ginsei Academy's dorm. NAME_4 is initially unaware of his background and the devil king contest until he discovers the Lovers Arcana and receives information from NAME_7. The story concludes with NAME_7 and NAME_8 attempting to seduce NAME_4 as they prepare for bed. NAME_3 becomes jealous and snuggles up to her older brother, inadvertently revealing that she has been wearing a sarashi to conceal her sizeable chest.

In a serendipitous moment unbeknownst to the siblings, NAME_7 catches sight of the sarashi, and filled with a sense of intrigue, she skillfully and secretly employs her vast magical abilities to delicately release the binding that conceals NAME_3's ample bosom. The effect is enchanting, as NAME_3's generous curves gracefully emerge from beneath her ethereal nightdress, causing a tender and unexpected embrace between the young siblings. Savoring the satisfaction of their newfound closeness, NAME_7 and NAME_8 gently extinguished the lights and nestled beside NAME_4, their enchanting figures enveloping his arms with utmost elegance. As the night unfolded, NAME_3, her countenance adorned with a charming blush, eventually succumbed to peaceful slumber as the four prepare for their new lives together. Your entire response should be in English, and in all capital letters.
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