Chitanda Eru and Houtarou Oreki - Hyouka comic. To be totally honest I'm not sure if this is fan art for a real comic or someone who just decided to draw this but it's cute and well drawn so I'm pinning it anyway.
I have a whole notebook full of things and pictures that make me happy. When I'm feeling really low I pick a page at random and read it then I spend the day appreciating those things. Works every time.