Waiting Online: I'll Transmigrate to Another World in a Day, Help!

[Decisive and ruthless, shamelessly invincible, across the Myriad Worlds, just a touch of romance, somewhat dark, one heroine] Su Bai suddenly finds a countdown in his head telling him that in one day, he’ll transmigrate to another world plagued by supernatural horrors! He immediately posts for help on Zhihu, and the experts all offer suggestions! In the end, Su Bai transmigrates with ten kilograms of books! They cover everything from steelmaking and firearms to shipbuilding and steam engines... After transmigrating, Su Bai is stunned! At that moment, he feels like hauling all those books back with him and going home! Even more bizarre, he suspects his little frog is up to no good! Stealing KDA Ahri from the start would be one thing... But it has never brought back a single normal thing!