An isekai fantasy about becoming a legendary guardian!At 34 years old, Kubo Tamotsu works at an exploitative company only to wake up one day in an unfamiliar world, reincarnated into the body of a six-year-old. Not aware of his innate Barrier Master skills, he finds himself on the slave market, and up for auction! When no one bids on him and he s queued for disposal, he is rescued in the nick of time żeby Marquess Basam. He will be raised as the Marquess' personal Barrier Master under a new name, Linus, and his talent as a Barrier Master will grow day aby day. His troubles never seem to end, as he struggles to survive!