In this world, upon turning twelve, individuals are bestowed with special weapons called 'Divine Weapons' by the gods.

Last, a boy living in a remote village, dreamed of becoming an adventurer alongside his childhood friend, Ruby. After undergoing the 'Rite of Blessing,' where Divine Weapons are bestowed, Ruby received a top-tier A-rank Divine Weapon, while Last was granted a tattered, F-rank [Rusty Sword].

Unlike his childhood friend, who was invited to a powerful party, Last was told his dream of becoming an adventurer was impossible. However, he refused to give up and resolved to fight with his [Rusty Sword].

Gradually defeating weaker monsters, he steadily enhanced his [Rusty Sword].

Eventually, after three years, the [Rusty Sword] finally reached weapon level 10.

At that moment, a skill awakened within the [Rusty Sword], and it underwent an 'Evolution' into an incredible demonic sword.

This is the adventure tale of an underdog boy's rise, who was consistently called the weakest.

※Now available as a book, published by Kadokawa BOOKS. A comic adaptation has also begun serialization on Gangan ONLINE.