Ore dake Haireru Kakushi Dungeon  

The Hidden Dungeon Only I Can Enter, Special training in the Secret Dungeon, 俺だけ入れる隠しダンジョン, Special training in the Secret Dungeon!, ดันเจี้ยนที่มีแต่ข้าเท่านั้นที่เข้าได้ ～แอบฝึกปรืนจนบรรลุสู่สุดแกร่ง～

Despite being of noble birth, Noir Stalgia occupies the lowest rank in society. His peers mistreat him and look down on him because of it. However, he possesses an exceptional ability to communicate with the Great Sage, a powerful oracle who can provide answers to any question. After failing to secure employment as a librarian, Noir decides to enroll at the Hero Academy in order to strengthen himself and gain entry. The Great Sage advises him to explore a concealed dungeon deep within the mountains. There, he encounters Olivia Servant, an alluring maiden trapped inside the maze. She imparts upon Noir extraordinary abilities that grant him near-total control over reality. However, there is a condition-every time Noir uses his powers, his life points decrease, putting his life at risk. To replenish his energy, he must indulge in worldly pleasures such as kissing his childhood friend. With his newfound abilities, Noir embarks on his journey as a student at the Hero Academy, making friends and assisting them through challenging circumstances.