Fate/Grand Order Cries of The Avenger in the Prison Tower

The Master, who was in Chaldea just moments ago, now finds himself in a prison filled with monsters and evil creatures, one of which attacks him. However, a mysterious Servant of the Avenger class comes to his aid. Meanwhile, in Chaldea, it is discovered that the Master's soul has been separated from his body and imprisoned in a place called the Château d'If. Will the Master be able to find his way back?