Disclaimer: I only own the fanfiction. Kenma belongs to the Shounen manga/anime, Haikyuu, written and drawn by Furudate Haruichi.
background music:
1. Kagaku henka (Haikyuu ost)
2. Best Friends (Kana Nishino)
3. cute music box    • Video  
I'm pretty sure the art is a cut out of one of the official arts, but just in case: all art credit goes to the original artist.