It was O'Brien who saved Fubuki from Fujiwara Yusuke. O'Brien receives a new mission from the II Company and returns to Duel Academy. In order to solve the mystery of Darkness, Juudai decides to duel Fubuki. Fubuki calls on the powers of Darkness and summons the Red-eyes Black Dragon. He then sacrifices Red-eyes Black Dragon to special summon Red-eyes Darkness Dragon, and attacks Juudai.
The entrance to Darkness.