"You Should Smile!" A Len Kagamine Love Story

Len Kagamine, is a seventeen year old boy who never spoke to people unless he was spoken too, he never smiled, never laughed, and it started to worry Len's twin sister Rin. Rin started noticing the change ever since Len came home late one night and it only got worse from there. Len would have major mood swings, he would be completely normal one minute and then angry and coldhearted the next. What would happen if a shy and kindhearted girl transfers into Len's class? Would she help Len smile again? Or would his cold personality get in the way?