Manga wo Yomeru Ore ga Sekai Saikyou: Yome-tachi to Sugosu Kimama na Seikatsu

Manga wo Yomeru Ore ga Sekai Saikyou: Yome-tachi to Sugosu Kimama na Seikatsu (マンガを読めるおれが世界最強 ~嫁達と過ごす気ままな生活~, lit. "I am the world's strongest, because I can read a manga.") is a light novel series by Nazuna Miki with illustrations by Wataame.

Plot
The world I was reincarnated into was a world that enables one to use magic after reading a Grimoire. Inside the Grimoire lies a manga, and this world's people would take around a year to read one Grimoire. However, for me, it would only take one hour.

Now, the six-year-old me can interpret and understand all kinds of Grimoires, and thus became the World's Strongest Master Sage.