Soon after Ken'ichi's defeat of Ragnarok, the Ryozanpaku masters find out about an alliance between some of their enemies. Now the entire Ryuzanpaku dojo, both its masters and students, find themselves targets of powerful martial artists.

Source: ANN

Note: Bundled with the 46th, 47th, 49th, 53rd (two episodes), 54th (two episodes), 55th (two episodes) and 56th (two episodes) volumes of manga. The OVA aired on television in Japan as an 11-episode series from April 9 till June 18, 2014 with the subtitle 闇の襲撃 (Yami no Shuugeki).

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Prequel: Shijou Saikyou no Deshi Ken'ichi