Episode 18.5: Recap Part 2, Episode 6.5.

When Dr. Eggman (Robotnik in the US version) holds the president and his daughter hostage, Sonic must comply to the evil scientist's demand of going to Eggmanland to stop Black Eggman and deactivate the city's generator before it reaches critical mass. Little does Sonic know that it's a trap to activate Hyper Metal Sonic, a robot counterpart built by Eggman to destroy our hero. (Source: ANN)

Xiao-Bai, a white snake demon, is sent on a mission to assassinate the Emperor's Taoist advisor, who has been killing snakes en masse in order to achieve immortality and curry the Emperor's favor. Xiao-Bai, however, is attacked by the advisor's lackeys before she can reach him and is subsequently defeated. Luckily, the demonic hairpin she was granted by the Snake Mother is able to save her life at the cost of her memories. Xiao-Bai awakens in the Snake-catcher village, unaware that she is actually a demon or that she is surrounded by her sworn enemies. She meets Xu Xuan, the man who saved her, and is charmed by him. The two set out on a journey to discover who Xiao-Bai is, and learn the secret of her demonic hairpin. The pair is pursued by Xiao-Qing, Xiao-Bai's sister, who has sworn to the Snake Mother to retrieve Xiao-Bai within three days or die trying. As Taoists, demons, and humans collide, a tale of forbidden romance unfolds.

Now that Akari Mizunashi is a Prima Undine and head of the Aria Company with her own apprentice, Ai Aino, she can't help but reminisce about her time as a Single. She has new responsibilities and much less time on her hands, but these changes bring with them new forms of miracles that Neo Venezia can give. Growing up into new roles is hard, but Akari can always count on the friends she's made on Aqua in times of need.