This is so amazing. Found this guy's acapella rendition of "Kimi ni Todoke" by Tomofumi Tanizawa, the anime's first opening theme, and it almost gave me goosebumps listening to it. This is a must-watch, or more accurately, must-listen for Kimi ni Todoke fans.
For those who haven't seen Kimi ni Todoke yet, here's the original song: