Fire Emblem Three Houses - Paralogue: Tales of the Red Canyon

Sothis began recalling vague memories from Zanado the Red Canyon and is unsure why that is, so she asked her vessel to take her there. The professor departing the academy caught the attention of the house leader and their retainer (in this case, it's Dimitri and Dedue), sensing something is going to go awry, the house leader suggests going after their professor. While Sothis began recollecting her memories at the canyon, monsters began showing up, trapping both her and her vessel.