[Machine Translation] After defeating the ferocious Earth Dragon, he passed the examinations of the School of Heroes with the top grade in his class. He was also exempted from attending school for the summer - and summer vacation arrived! Nol continues to spend his days in the hidden dungeon, meeting a girl named Leila who belongs to a rival guild, and preparing to open a store with his family to sell materials for demons. Then, Nolu is invited as a chaperone to attend a nobleman's party that his childhood friend, Emma, is attending. But then the phantom thief, who causes a commotion in the town, appears...?