 If you liked
Yugami-kun ni wa Tomodachi ga Inai
|
 ...then you might like
Kimi to Uchuu wo Aruku Tame ni
|
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.