Mio Keisuke is a high-schooler who leads a rather dull, boring life. He can't keep a girlfriend – because being a kept man's too much of a hassle, and he can't bring himself to fall in love. Then, one day, he seeks shelter from a sudden downpour under the awning of an apartment owned by Yugi Kakeru… and suddenly his life isn't so dull anymore, as he finds himself falling for his aloof and yet obviously lonely friend.