Kelvin wakes up in an unfamiliar world having traded away his old memories for the power to summon spirits, with Melfina, the goddess who sent him there and his first summon, at his side. What starts as an ordinary adventurer's life quickly reveals Kelvin's real passion: hunting down the strongest, strangest enemies he can find, from a Black Knight guarding an ancient castle to a demon sealed inside a hidden cave. The half-elf Efil joins the party soon after. This light novel series is ongoing.