Tập 1: Mayumi Hashimoto gửi bạn cùng lớp Yoshimi Kuroda xuống địa ngục sau khi chịu đựng nạn bắt nạt và tống tiền tàn khốc.

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Mayumi Hashimoto, a junior high school student, is bullied by classmate Yoshimi Kuroda: the latter framing the former for embezzling class money, coerces her into immoral behavior and then blackmails her with photographs of the activity. At her wits' end, Mayumi overhears of a website that can send the object of one's grudge to hell. Visiting the website at the appointed time, Mayumi learns that the price of sending her enemy to hell is the cost of her own soul. Mayumi hesitates, but her situation gets worse. In desperation, Mayumi sends Yoshimi to Hell. Free of her enemy, her life becomes peaceful again; yet she now must live the remainder of her life knowing that she is bound for hell, bearing the mark on her chest. (Source: Wikipedia)