The Self-Cultivation of a Background Male Protagonist

Once upon a time, well, not that long ago actually, in a certain city in a certain country, there was a young man. The young man could enter another world in his dreams, but he wasn't a member of the Secret Sealing Club. The young man had very few friends, but he didn't belong to the Neighboring Society either. The young man claimed to have superpowers, but he didn't come from the Far East Magical Daydream Society... Wait, why is this club's name so long?! "I, under the name of the Evil Lord's True Eye, command you, swear to me with fresh blood and establish..."