Tsubasa Chronicle: Tokyo Revelations

Thor and Rai are twins who live on an advanced space colony called ‘Juno’. Things take a nasty turn one day when they are kidnapped by the Federal Army’s Special Forces and abandoned on the hostile prison planet Chimera. A cycle on Chimera consists of 181 days of scorching heat and 181 nights of below-freezing temperatures – not to mention it is populated almost entirely by carnivorous plants. The convicts on Chimera have found only one means of survival – reverting back to the law of beasts. For the strong-willed Thor adjustment comes naturally; but for his naive and weaker brother Rai, things do not go as well. Thor must now use all his wits, strength and courage to endure life as a member of Chimeran society, rise above the rest, and take the only ticket off this planet: becoming the Beast King.

In downtown Tokyo, walking the streets has become dangerous once the day turns to night. Lifeless demons called "Oni" have taken over the streets and are devouring innocent citizens of Tokyo, leaving them dry and lifeless. Kyouichi and Tatsuma are two high school students who hold supernatural abilities that allow them to defeat the Oni at night. Though they continue to fight what seems to be a never ending battle, they've yet to discover the main threat towards humanity -- the group working behind the scenes in charge of the Oni...