S1·E25 The Ultimate Game

The fight between the group and the Oni continues, while Seishirō is told the real truth behind everlasting life in the game. Syaoran climbs to the top of the rollercoaster and tells Seishirō that he doesn't think he will be able to beat him in his current state. However, he has decided to get the feather back; so he draws his sword even though he knows he's not quite ready yet. When he draws the sword, it bursts into flames and the fight begins. Seishirō takes off soon after the fight begins, but as he leaves, the Oni are left behind for them to take care of. After finishing them off, Mokona reacts to the power of the item Seishirō used and takes the group to the next world.