Having fun in school, doing homework together, cooking and eating, playing video games, watching anime. All those little things make up the daily life of the anime-and chocolate-loving-Izumi Konata and her friends.

Haré was a happy boy living in the jungle with his mother, but then one day Guu showed up.

The Mobile Shinsengumi was organized for the specific reason of keeping Kyouto safe from influences which would hinder Japan's efforts towards westernization, be those demons and monsters of every shape and size or a band of misanthropes bent on turning the clock back for the city of Kyou. Yuuko Kondou, Toshie Hijikata, and Kaoru Okita are daughters of the reknowned Isamu Kondou, Toshizou Hijikata, and Soushi Okita, leaders of the feared, original Shinsengumi. They have come together under the banner of "Truth" as their fathers once had and under the guidance of Ms. Oryou. With the help of Oryou's son Ryuunosuke, Shintarou, Gennai, and the cat monster Nekomaru, they protect Kyouto from the evil that lurks in the shadows. But, who protects the people of Kyouto from the Mobile Shinsegumi?

A shy duelist stumbles upon the legendary Red Eyes Black Dragon, with that card in his possession, he must learn to bring out his confidence to duel.