: Saitou uses his ability to measure and memorize complex patterns to assist the senile magician Morlock. He effectively acts as Morlock's "memory," allowing the wizard to cast high-level spells he would otherwise forget mid-incantation.

While the text "useful feature" doesn't correspond to an official software tool, it likely refers to a specific showcased in that episode. In Episode 6, titled "Memories of an Old Magician," the story focuses heavily on the "useful" nature of Saitou's modern-day handyman skills when applied to a fantasy world. Key "Useful" Highlights from Episode 6:

If you were looking for a technical feature related to the video file itself (like a specific media player setting or a site feature), could you clarify what you're trying to do with the file?

: The episode highlights how Saitou’s mundane knowledge of locks and hinges is more efficient than magic for navigating ancient labyrinths, saving the party's mana for combat.

: Unlike the heroes who rely on fixed stats and spells, Saitou’s "feature" is his ability to find creative solutions to niche problems, proving that even a "normal" person can be indispensable in an Isekai setting.