The quest Alone in the Dark has disappeared

[Sweetie Pie]

After completing the first mini-dungeon, I went to the vendor and turned in the quest. After which he completely disappeared. Miki-10 did not have it in its assortment.

[AsPiDe]

Same problem. For a while at least there was the ghost... ghost in Micha's room, now that too is gone

[Kainoo]

Same problem here, do you guys got an solution?

[EckyThump]

Try the Quest Archive at the Tower.