Isekai Tensei de Kenja ni Natte Boukensha Seikatsu - [Mahou Kairyou] de Isekai Saikyou

Synopsis:

Minato was reincarnated in a universe where Offensive Magic is still legal after his untimely death. For the first time, he was excited to see that Offensive Magic, but he could not help but wonder why all the magic circles are so ineffective! He chooses to apply knowledge from his former, much more developed world to enhance the magic in this new one after observing how ineffectual it is. Join Minato as he works to enhance his new home's magic!