Lugh and his companions accept a contract to assassinate the corrupt nobles assisting a slave auction. During this time, a flashback of his past life shows he was training a rookie while simultaneously taking out members of a crime guild.

Shin Wolford is a boy, who used to work in an office in Japan, but after being killed in an traffic accident, is reborn in another world, where he learns magic from his adoptive grandfather, Merlin, and grows up sheltered from the world.