Rio continues her relentless attack on Muhyo and the others, refusing to even listen to the fervent pleas of her own pupil, Bico. Those who have sold their souls to a messenger of Hell using forbidden magical law can never be human again... but Muhyo says there may be something they can do for Rio. However, he needs to recover from his mental numbness in order to do it. Backed into a corner, the team gambles everything on a secret formula concocted by Bico to help him temporarily recover...
The most secret of secret formulas...
...أكثر التركيبات السرّية سرّاً
Das geheimste aller Geheimrezepte.
La más secreta de las fórmulas.
La más secreta de las fórmulas.
Peu d’Exécuteurs connaissent
le plus secret des remèdes.
La più segreta fra le formule segrete...
A mais secreta das fórmulas secretas...
Самая секретная формула...