World's Strongest Striver ～Blessed with the Unknown Aptitude for Effort Only I Can Muster Extraordinary Levels of Effort to Make Me the World's Strongest～

In order to defend someone precious to him， he’ll use “Effort” to become invincible?! In this world, at twelve years old, all children have their “Aptitude” or special skill revealed which will guide them in the future. With cool Aptitudes such as “Knight” or “Wizard” being not uncommon, Rivelle is