Rakko Umi e Kaeru! Among the world's most powerful otters is Rakko 9-gou, the abandoned and forgotten "Lost Number" who seeks vengeance on the human race. Rakko 11-gou attempts to foil the plans of his adversary, but his "Olivine Tholeiite" attack has no effect on Rakko 11-gou's tail of carbon nanotubes! Can Rie and Naho make it in time to save Rakko 11-gou?

Reversi PV This is the vigorous theme song that begins each episode of Reversi, a gripping anime about Schwarz, a demon of darkness; and Weiss, a demon of light.

The Bakuman. 3rd Season Specials are bonus shorts featured on the first and second Blu-ray and DVD boxsets.

Otter goes back to the sea! Within the Bakuman. universe is a successful manga called Rakko 11-gou by the fictional Kazuya Hiramaru. The first special serves to showcase what Rakko 11-gou's anime adaptation looks like. The fictional episode is titled "Rakko Umi e Kaeru!" (ラッコ海へ帰る!).

The short features an original song, "Rakko 11-gou" by Hyadain, which serves as the ending sequence for the fictional Otter 11 anime. The song is Track 31 on the Bakuman. OST 2 album and Track 6 on Disc 2 of Hyadain's 20112012 album.

Reversi PV Another manga in the Bakuman. universe is Reversi. The second special serves to showcase the theme song of Reversi's fictional anime adaptation. The music used for the fictional theme song is "Frame in Flame" by OLDCODEX.