A huge oni arrives on Earth carrying a precious cargo: a baby boy, which he leaves with a young human couple with the instructions that they are to raise him as their own until the oni returns in 15 years.
Jiro gets attacked at some temple and a bunch of new characters show up to help him. This new team escapes and returns to Jiro's house for introductions, not that this matters since his mom and Miyuki get kidnapped and they have to rush to the rescue.
Jiro's mom has gone insane over the loss of her boy and is sent to a mental institution. Jiro and the rest are in some dimension being attacked by Oni of all colours and Jiro ends up in space while the rest end up in ancient Japan.
We also get to see how Jiro's mother has been painting Oni paintings on the walls of her room and they are of the insane variety. The dad decides the paintings are bad and smashes the walls of the hospital down with a sledgehammer. As he smashes them, the world the Jiro team are in, starts to collapse and everything blows up.
