Tensai Dai Ni Ouji wa Hikikomori Tai: "Koku Kaishi" no Mujikaku Musou

Neet van Avadora, the second prince of the great kingdom of Astoria, is a homebody who loves nothing more than staying indoors. After cutting himself off from the outside world for years to devote himself to magical research, he has, without even realizing it, grown into a true prodigy of magic.