During a battle for a relic, Optimus and Megatron are sent to another dimension, the demon slayer dimension. Now one a human and the other a demon, they must navigate this world, in a time before their own with even fewer technological advancements than the Earth they came from, with little chance of going home. As they go forward, they will make friends, enemies, and allies and try their very best to go back to their world. OR Tanjiro thought they'd finally catch a break, but nooo, a mysterious not-couple-couple, both of whom obviously had feelings for each other and insisted that they were from another dimension as soon as possible (a little side note, both me and ImaginationsPortal are working on together, so when they put this on their page, they're not steal this work)