Noir Stardia/History

Prologue:
As he got out of bed, he was preparing for his first day at work in a library, but as he descended to the front of the house, Noru was surprised by an unusual scene, his father was lying prone to the ground, apologizing, when he heard the explanation, understood that his father was disagreeing for not having managed to fix his job through his connections, being better said, another person with better connections took his place, Noru is just a Baronet, while his opponent was a Viscount .Being a stranger the son of a nobleman, even being the third son of a Baronet, being unemployed, was proposed to enter the Hero School. Not giving much importance to the comment he leaves home for his usual outing.

On his way he meets his childhood friend Ema, who was happy with the idea of being able to work with him, after telling him the situation of his job, she gets more upset than him. She explains that she has been researching on the Skill that he has 'Great Sage'. When the skill is mentioned, Noru becomes apprehensive, because he thinks it is a disperdicio such a fantastic skill, to be in his possession, because whenever he uses it, he is assaulted by an immense headache. Soon Ema explains that, the old sage Merlin suffered from headache, he would have his wives gathered so he could kiss them.

So they decided to test this theory, where Emma "because of her gentle nature" would help her when she suffered the headache. To help with the weather they went to the clock tower, and they kissed, then he tried to use the skill, and asked the skill 'Great Sage': "I need to get stronger so I can pass the admission exam What would be the most effective method? ", he realized that the headache was not coming, so the theory of the kiss was valid, he received the answer:「Answer. Entering a Hidden Dungeon would be optimal.」"Where is the closest Hidden Dungeon?", while asking the headache appeared, but Emma "helped" him, then he received the Sage's answer,「Please enter the grotto 14645 meters south west. Go on for 100 meters. Push the rotating wall on the left to reveal the stairs to 『The Unending Dungeon』」, and he departs to his destination.