Artist's commentary
Koishi Day 2015
I hear it's Koishi Day. LOL
I drew this in a big rush, so I guess the canvas was huge.
I love Koishi-chan too, so thank goodness I made it in time! 5-17 = ko (go) - i(chi) - shi(chi) = Koishi. She actually wrote "campus" instead of "canvas", but based on context, I think it's a typo.