Itsuki finally forms his own Air Treck team, but his roommate, legal guardian, and all-around hot babe, Rika, confiscates his Air Trecks and forbids him to ever skate again! Does she really just have Itsuki's best interests at heart?

Itsuki and Rika are having a big fight, and there's only one way these bickering almost-siblings can settle their differences: an all-out, no-holds-barred, extreme skating battle. For Rika has revealed her secret that she was once a top Air Treck champion! Can Itsuki defeat this formidable queen of the skies and get back on track?

Ikki's the captain of a pretty good extreme skating team... Pretty good, that is, for a bunch of newbies! The players have more heart than talent, but so far, that's landed them close to the top. Now they're facing a matchup that's going to take more than guts to win: a battle to the death with Behemoth, the most reckless, cruel, and murderous team in the league!

Now that Ikki's new team of extreme skaters have faced off in a battle to the death with the Behemoth, what's in store for them next?

The last phase of the ultimate battle between the underdog Kogarasumaru and the fearsome Behemoth has begun - and it's up to Ikki and Agito to seal the deal and achieve Air Treck glory. All Ikki wants is to be the greatest Air Treck rider ever, but for Agito, the battle is personal. Could it be that the key to victory lies in Agito's past?

Kippei Katakura is a 17-year-old playboy who spends his time chasing girls, careless of their feelings. But when his 5-year-old cousin Yuzuyu comes to live with his family after her mother's sudden disappearance, Kippei is put in charge of taking care of her. As Kippei gets to know Yuzuyu and starts to understand how she feels, he also begins to realize that all girls were like Yuzuyu once...

Kippei is busy trying to become Kokoro's boyfriend and slips back into his irresponsible ways. He oversleeps and doesn't have time to make Yuzuyu's lunch. Even worse, he spends an afternoon with Kokoro, forgetting to pick up Yuzuyu at kindergarten. Yuzuyu feels like she has become a burden to Kippei, so she decides to walk home by herself... and ends up disappearing!

A stranger is seen lurking around in the kindergarten, and Kippei is asked to investigate, When he finds the stranger, he recognizes his Aunt Miyako - Yuzuyu's momma! Kippei confronts Miyako and learns why she left Yuzuyu in the care of Kippei's family. Kippei wants to reunite Yuzuyu with her mother, but is Miyako ready for such a step?

Kippei can't understand why Kokoro is acting distant and refuses his touch. She hasn't told him about Itagaki, a boy who confessed his love and forcibly kissed her even though she refused him. Kokoro is too scared to talk about it, but if she doesn't open up soon, the situation could get worse.

Yuzuyu has a new classmate, Aya, whose older sister takes care of her just like Kippei takes care of Yuzuyu. Unfortunately, Aya and Yuzu overhear Aya's sister complain to Kippei about having to take care of a small child. Kippei starts spending time with Aya and her sister to help out, but Kippei's girlfriend Kokoro is the one who needs Kippei the most...

Kippei finds a photo of Yuzuyu's mother in the wastebasket. When Kippei shows the photo to Yuzuyu, asking her if she threw the picture of her mother away, Yuzuyu doesn't remember. In fact, Yuzuyu doesn't even know who the woman is - she can't remember her mother at all!

Akihabara@DEEP. It is an enterprise that is small but elite and organized by the legendary otaku of Akihabara. Soon, they'll be dragged into the struggle for supremacy in a world of information technology. A battle is about to begin in the Akihabara district for the future of the industry.