──Oh, my beloved. Eternal happiness, with me.

Keiko Satou, a woman who has never known love, reincarnated into a dark yandere otome game where all endings – special or bad – were confirmed death endings. This game had a unique setting, allowing players to choose between the main heroine and the villainess.

Having played this game extensively in her previous life, she reincarnated as the main heroine, effortlessly cleared the special ending, and died happily, enveloped in bliss. When she next awoke, she had reincarnated as the villainess, again clearing it with ease for another happy death. Again as the main heroine, and then as the villainess… repeating these alternate reincarnations, she thoroughly enjoyed the special endings with the five yandere capture targets.

Now, for the tenth time – clearing this one would mean she had conquered all special endings for every capture target. She was more motivated than ever, but the moment she looked in the mirror, she was dumbfounded. For some reason, this time she hadn't been reborn as either heroine, but as Margaret, the deceased older sister of Lionel, one of the capture targets.

For the sake of her beloved family, she couldn't die this time. Resolving to do anything necessary, she struggled, making full use of her otome game knowledge. She schemed to use the villainess, but for some reason, the villainess grew fond of her, and this time, her desire not to let the villainess die exploded. She tried to interfere with the relationship involving the First Prince Edgar, one of the capture targets, but for some reason, he became interested in her instead.

Despite repeatedly almost succumbing to the temptations of Edgar, her ultimate bias from her previous life, Margaret, who couldn't afford to die, tried to distance herself. However, day by day, his obsession grew more intense.

"I won't let you escape, my Margaret."

Her yandere ultimate bias whispers in her ear──.

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