Talent Level Increased by One, a Transcendent Star Wizard

[Wizard + Leveling Up + Adventure + Cthulhu]

He was transported to another world and gained the talent that could increase any skill or technique by '+1'.

Once you break through the existing level bottleneck, '+1' will allow your skills and techniques to reach a new level.

Doing the exercises according to the answers? That doesn't seem too difficult for Natsumi.

When the stars shine brightly and all things come to an end, the summer's radiance will finally illuminate the world...