Sentai Red Isekai de Boukensha ni Naru

Summary:

In the final battle against the evil Exterminators, Tougo Asagaki, a power ranger, traded his life for the enemy's. It seemed like everything was over, but suddenly he found himself in another world! He becomes an adventurer, transforming into Kizuna Red, and continues fighting to save people in trouble! Here he meets a young Wizard named Idola and his journey in this new world begins! (Source: MU)