Light Novel (Other) A hidden dungeon where only I can enter ~ Secretly trained to be the best in the world ~ (4) K Lanobe Books
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One day, half of his summer vacation, he received a letter from his brother Gillan, who was attending a school to become a merchant in Hornest, another country. According to the letter, he wanted to see him for the first time in a first time in a long time, so he asked if he would like to come and see him. He then proceeded to the town of Hornest, where his brother lived, while capturing hidden dungeons and performing quests. It was a pleasant journey with Emma, Laura, Luna and Leila. But the town of Hornest that he reached was attacked by a large number of demons?