Bramble has always dreamed of becoming a great hero in order to gain recognition from everyone, especially his older brother, Briar. A piece of the alien nucleus that fell from the sky broke the peace of Pine Tree Mountain, but unexpectedly, Bramble merged with the alien nucleus and became a bear with alien wisdom and energy. However, this also brought about the pursuit of "alien" Abu who wanted to reclaim the nucleus.

Yui is an average schoolgirl who lives in a future where all computers are supported by a single global network known as COMNET. Yui is a computer-illiterate girl who after a computer-lab accident is approached by IR, a raccoon looking corrector computer program, which tells her she must save COMNET. She must stop the rogue A.I. (Artificial Intelligence) computer program known as Grosser and his hench-programs from taking over the world. Grosser was originally designed to be that manager of all of COMNET. At first she's very reluctant to play the heroine because of her complete lack of knowledge and ability with computers. To save COMNET she must find and gain the trust of the other seven wayward corrector programs. They must also find the creator or COMNET Professor Inukai, to help stop Grosser for good.

Anubis, an ancient Egyptian evil that was defeated by Yugi's alter ego centuries ago, has returned to exact revenge. Wielding the power of the Eighth Millennium Item, Anubis is determined to destroy Yugi and take over the world.