Hikikomori Oji no Kareinaru Yonaoshi

Noel, the Seventh Prince of the Kingdom of Emanuele, is an eccentric shut-in who cares for nothing but immersing himself in his hobbies.

One day, his childhood friend Claire, a Baron's daughter, arrives at his doorstep. She reveals that she has been robbed of a precious necklace on top of having her engagement cruelly annulled.

Hearing this, Noel decides to step out of his seclusion. He resolves to confront the villains by utilizing the vast knowledge he has amassed through his obsessions!