Unpleasant Awakening Episode 5

Reiji wants to become stronger than Hikaru, so Agent L shows him a secret training room. Kyoji and Sayaka are already there, giving Reiji some pointers. Meanwhile, Maiko has no idea where Reiji has been going, but when she spots him him with Agent L, she drags Daisuke to spy on him. They follow him into the secret training room and are attacked by two powerful dragons. When all hope seems lost for the two, Reiji shows up and easily defeats the dragons, but who is this new powerful dragon that Reiji is on top of?