Kimi to Uchuu wo Aruku Tame ni
Spacewalking with You

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Both series feature a main character who is really knowledgeable/smart but has trouble with everyday life and communicating with other people. Ousama is about cyber security and surviving in the business world, while Kimi to Uchuu is about astronomy and more high-school related. While themes are different they share other similarities as well, like the second main character helping the main character and vice versa (so there is a nice symbiosis between the MCs and it's nice to read). 

Both series feature main characters who like to be in their own world or do things their own way. The second MC observes it and learns a lot from it. Character relationships feel wholesome so feel free to give these series a try if you like slice of life series with interesting main characters.