Tsubasa RESERVoir CHRoNiCLE: Tokyo Revelations

The group arrives in a desolated Tokyo. Running under cover from the acid rain, Syaoran and Mokona run into Kamui and his group. Sustaining bad injuries, Syaoran is rescued by Kurogane, who then fights Kamui to a draw. Deciding that the travelers aren't thieves, Kamui allows the group shelter and receive treatment for Syaoran's wounds. Kurogane speaks to Fai about his past, and then later the group runs into Fuuma and his group. The Syaoran being held captive by Fei Wong Reed awakens. (Source: Wikipedia)