If you're looking for manga similar to Yamiochi Knight ga Dungeon Hajimemashita!! (Light Novel), you might like these titles.
Dungeons suddenly appeared in real life. Monsters wander about in the dungeons, and strength is gained by defeating monsters. Those who conquer such dungeons are called Seekers. The protagonist is a simple farmer who lives in the sticks. One day, a dungeon appears in the garden of his house and in order to decide what to do, he enters the dungeon. That dungeon wasn’t much compared to the dungeons the protagonist knew and was clear he would be able to handle it somehow. He decided to conquer the dungeon while doing farmwork. A protagonist who does both farm work and dungeoneering. In his future lies...
Eldias, an island where only one wish will come true by capturing 7 dungeons. On the island where adventurers gather and compete, there was a boy with a perennial level 1 luggage. The experience value he needs to level up is… about 100 million!? The boy is on the path to the strongest with the ultimate skill of “never die” while facing the tremendous number that everyone is merciful.
Dungeon Sherpa, a general term for those who make a living by carrying the baggage of adventurers while leading the way for them in their search through labyrinths. Rou is a young but skilled sherpa whose activities are based in Tairos Labyrinth. Alhough Rou lost his father half a year ago and works to support his younger sister who he lives with, he is forcibly dragged into helping the hero who made a name for herself at the royal capital as the "Twilight Blade."
A small dungeon is fine. And yet I create a massive and powerful dungeon. Chrono is an ordinary demon attending a dungeon creation class at the demon lord’s academy. Upon hitting 20 year’s old, Demonic Beings are encouraged to attend the academy and live there while perfecting the art of creating dungeons. Chrono thinks that creating a small dungeon would be sufficient, however, what emerged was an extremely massive dungeon with hundreds of layers. Moreover, the level of the dungeon exceeded the dungeon created by the legendary demon king by a large margin. Chrono who was looking for an ordinary and comfortable life quickly became the focus of attention of many and quickly rise up within the demonic society. It won’t take long until he was hailed a hero.