Am I Actually the Strongest? manga volume 6 features story by Sai Sumimori and art by Ai Takahashi.

Haruto's on thin ice--Professor Tear discovered the magic used on Schneidel is Ancient Magic, which no one alive can wield. Worse, she began to suspect a connection between Haruto and the mysterious Black Knight and became determined to find the truth. Force to come to his copy's defense as the Black Knight, can Haruto manage to keep his secret, or will he be exposed? And what is Schneidel plotting in the shadows?