Noel, the Seventh Prince of the Emanuele Kingdom, is a bit of an oddball who is so immersed in his hobbies that he has become a Hikikomori. However, a major incident occurs: his childhood friend Claire, the daughter of a Baron, has her engagement annulled...! In response to the cruel treatment Claire received, Noel finally stands up. Using the knowledge gained from his hobbies to brilliantly defeat evildoers, the story of a Hikikomori Prince's quest to reform the world begins.