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One day, a maid with cat ears who claimed to be the reincarnation of her dead father gave Mo Ranye a pair of glasses that could see through other people's abilities. From then on, Mo Ranye discovered that all seemingly ordinary family members were hiding shocking secrets. A kind grandfather who is over fifty and loves fishing is actually the former leader of an evil organization. The eldest sister is a gentle, graceful and professional woman, but she is essentially a physics-based magical girl who believes in a real woman's fist to touch her heart. The middle sister who has no attributes and loves racing is not only an alien, but also the Red Warrior of Super Sentai. Even the sixth brother who is still in elementary school is not simple. He is a top fighter. In order to realize his wish, he engages in killing top duels every day. However, Mo Ranye himself did not give in too much. Because... He is a hidden BOSS who hides in the dark and may destroy the world at any time!