Am I Actually the Strongest? novel volume 6 was written by Sai Sumimori with illustrations by Ai Takahashi.

Reincarnated in an alternate world, Haruto Zenfis is living the dream as a carefree shut-in... at the royal magic academy. Things aren't going exactly to plan, but what's wrong with a little hiccup? Just as he's finally getting settled into his days of sleeping in, watching anime, and enjoying his little sister Char's company, a school-wide magic competition begins. It's just a school event-no biggie, right? Wrong! Here we have yet another mysterious transfer student situation, and they're already getting way too chummy with Char! Meanwhile, the final showdown between mother and son is looming...