My Guild Isn't as Normal as I Thought It Was

Dylan Harper is an ordinary teenager with a penchant for video games. One day he finds a mysterious book about a game, with an awfully sketchy map inside of it. Intrigued by his love for games and curiosity, Dylan follows the map only to find himself magically transported into a world where guilds of adventurers undertake quests and battle mythical creatures. Excited but confused, Dylan adapts to his environment and decides to join a nearby guild, thinking it's a steppingstone to a grand adventure.