My Weapon is a Loli

My Weapon is a Loli summary:

Reynold is one of the worst students of the [Traveler’s school] which trains students to protect the balance of [story worlds], supporting heroes behind their backs. In order to become stronger, he used all his [Traveller points] to exchange for a demonic blade which turned out to be a seemingly unreliable Loli, can the last placed Reynold really become stronger?