Noroi no Maken de Koufuka Training! Shirarecha Ikenai Kamen no Boukensha summary:
Tris, the third son of a rural aristocrat, was training to become an adventurer. One day, Tris is presented with a magic sword whose ability is unknown. Until he was fifteen, every day he just swung his sword, unaware that he was a cursed magic sword. A boy who has been training with an ultra-high load with the power of a magic sword suddenly gains the power of a hero class-- !? MF Books will release the first volume of the book version on 5/25 (Monday) !!