ANIME requested INFO
Donten ni Warau Gaiden: Ketsubetsu, Yamainu no Chikai
Plot Summary: One year has passed after the great battle against the Orochi. Tenka had been paralyzed from the final battle and he took part of the government's human experiment before the battle. Tenka withdrew himself from society, but his younger brothers, Soramaru and Chuutaro, find out the secret past about their older brother.