Left Behind by My Friend Who Transmigrated to Another World

Oliver has a headache named Liam Hartford.

From the time they were young, he could have made a career out of cleaning up Liam's messes. He had even begun to think that there wasn't any trouble left that his friend hadn't already been in... until he discovered that Liam had transmigrated to a world straight out of a fantasy novel.

Left behind in the modern world, Oliver has to rely on his years of ass-wiping experience and a shoddy cell phone connection to keep this idiot alive.