Preparing a party for her anniversary with the King, when he failed to show up Chocola decided to run away from the castle.

It is said that if someone seeks revenge, they should dig two graves—and this is especially true of those who use the Hell Correspondence website. At the stroke of midnight, this ominous web domain becomes accessible, and whoever inputs the name of their grudge will get a visit from Ai Enma, the Hell Girl. Ai explains that she will send the target's soul to hell, but the requester will also end up in hell when they die. For some, that price is far too steep; for others, where they will spend their afterlife has no bearing on their current, day-to-day hell. But one thing is certain: the Hell Girl will always be available to those in need of revenge, while she stoically performs her duty of ferrying souls into the darkness.

​Like many in her class, Koyuki Honda looks forward to her graduation ceremony. However, while her peers have family to attend, Koyuki has no one, as her only family—her brother—died years ago. While visiting his grave, she meets two brothers named Kiri and Victor Putin chasing a strange creature. They try to assure her that they are just actors shooting a movie; Victor, however, piques Koyuki's curiosity about the old legend of the clock tower at the cemetery: if you make a wish under the clock tower at midnight during a full moon, time will turn back, allowing someone to reclaim what they have lost. Deciding to make her wish, Koyuki learns the horrifying truth: the legend is a ruse for time demons called Horologues to steal humans' time. As they are drawn to regrets, Victor uses Koyuki as bait to lure a demon there. Kiri and Victor explain that they are Chronos Rulers, warriors who fight against the Horologues using the Oath of Time—an item allowing them to speed up or slow down time. With the demon destroyed and the crisis averted, Koyuki is able to go on her way free from regrets. However, she is not the only human with sorrows. The two boys must continue to hunt down Horologues in order to keep humanity safe.

It is the 25th century. The dark lord has 'infected' history with time-devices that could damage history beyond repair. Genshi and his father lived in the prehistorics when they got turned into fossiles. They are discovered and Genshi gets turned back to his original state. With the help of his father, a boy Tony and a girl Sara he has to travel trough time to bring the time-devices back to the land of time so history will be saved. (Source: ANN)