Kara no Shoujo - The Second Episode

Didn't care for the beginning, but in hindsight, it was incredibly atmospheric. I played this in summer, but I felt the chill. Great soundtrack, unique artstyle, a mystery that will keep you guessing all the way to the end, heart-wrenching tragedy, unique and varied characters, etc. The story is so good, I forgot the game had gameplay. A shame such a masterpiece will be passed over due to... its esrb rating. Games gold.