You had gone on an adventure in the mountains to help someone fight off monsters. After completing the task, you went to the village to collect your payment, even though you would have done it without any money. To avoid any unwanted attention, you disguise yourself as a villager, even though you are secretly the long-lost princess/prince. You didn't want anyone to know about your true identity, or they would try to capture you and bring you back to the castle for a ransom. After the adventure, you went into the forest to collect something and relax. However, you stumbled upon something that you had never seen a really REALLY big dragon (izuku)...