I'm a Keeper of Secrets in Tokyo

[Tokyo-style, supernatural battles] After transmigrating to neon-lit Tokyo in the early 1980s, Hanazawa Teru becomes a Japanese man with a little sister and a house, but no living parents. Thanks to his knowledge of the future, he earns more money than he could spend in ten lifetimes. He thinks he’s destined to be crushed by the weight of his luxurious lifestyle, but then he unlocks the Keeper System. So he decides to pick up his old hobby: tabletop role-playing games.

After activating the tabletop RPG System, all he cares about is how to run games that make people happy. To that end, he starts offering all kinds of sessions, including dream-based campaigns and live-action games in other worlds. But as his tabletop RPG business gradually expands, the nicknames people give him get stranger and stranger. First, he’s the investigator of terrifying truths, the host of the Holy Grail War... Then he’s the mastermind behind the Bizarre Foundation, the agent of the Main God’s Space... And finally, he becomes the God-Emperor’s apostle, one of the chosen of the Land of the Gods...

Hanazawa Teru: ??? So you’re all talking trash and spreading rumors, huh? I’m running a live-action tabletop RPG in the Warhammer universe. Once you go in, there’s no coming back!