Nasu Veronica is one of the most potent Specters alongside Bennu Kagaho, and also the most monstrous ever appeared.
When Pegasus Tenma , Yuzuriha Crane and Unicorn Yato head for the Cathedral of the Forest, they find the Forest of Death in his way. Upon entering, Veronica, from the shadows, using his creatures to divide the group, facing a swamp Yuzuriha living in a giant insect Yato and Tenma with zombies raised from Anna , Caro and Maria , children who lived in the orphanage. Veronica starts singing and Tenma discovers his position, when he realizes that the body uses to control Veronica needed resurrected children, Tenma destroys the instrument with its technique Pegasus Sui Sei Ken .
Tenma start fighting but can not beat Veronica flies because he controls and that are able to stop the beating of the Tenma . Yato and Yuzuriha join the battle, but soon surrounded by more zombies. Suddenly, the souls of the dead disappears, through the power of Cancer Manigoldo. Manigoldo starts to joke with Veronica feminine appearance, coming to insinuate that the Specter was trying to flirt with him. Veronica attacks him with his flies, but Manigoldo easily gets rid of them, and then attacks with his physical technique “Acubens”, cutting Veronica in half.
However, through the power of Thanatos, Veronica is immortal and therefore recovers from his wounds, throwing away his torn robe to reveal his majestic Surplice. Manigoldo wanted to check if he really is immortal, and then launches Yato into Veronica. Yato uses his “Unicorn Gallop” technique, which crosses his still open wound. Veronica survives and begins to rot the Unicorn Cloth, but Yuzuriha saves Yato.
An enraged Veronica uses his “Burial Fort” technique, rotting everything around, but Manigoldo used his “Seki Shiki” technique to lure Veronica’s soul to Yomotsu Hirasaka, thus depriving him of the immortality granted by Thanatos. There, Manigoldo uses his “Seki Shiki Kisouen” attack to incinerate Veronica’s soul.
While dying in flames, Thanatos’ cosmo appears. He criticizes Veronica’s incompetence and orders him to do a final suicide attack and finish Manigoldo. A five pointed star appears in Veronica’s front, as he launches towards Manigoldo, both being engulfed by flames.
On Earth, Tenma, Yato and Yuzuriha watch as Veronica’s real body begins to rot (as well as all the Forest Of Death), and wonder what happened to Manigoldo. Later, they will realize that the Cancer Saint has won the fight and is still alive.