Transported to a secluded ruined area, Chrono cardfights Ryuzu. While battling, bits of Chrono's lost memories regarding his father slowly pop into his mind until he finally recalls the incident involving himself, Rive, and Ryuzu. As it turns out, Rive and Ryuzu were friends who were working on creating a link between Earth and the planet Cray. One day, Chrono was brought over to a laboratory and watched an experiment in which Rive was used to open a portal to Cray. However, Rive later learned how Ryuzu wanted to sacrifice Cray for Earth's benefit. While Rive argued with him, Chrono heard a voice calling him from the Cray side of the portal...