New entry in the Pretty Series.

Virtual reality. Murder. Werewolves. And teen girls! In a future where nothing is as it seems, can old legends come true? In the near future, humans will communicate almost exclusively through monitors, making real interaction a rarefied and weak occurrence for those living in a near totalitarian society. In this new world of communication, children are only allowed to interact personally on school grounds. So when a serial killer starts slaughtering junior high children the communication routes go under further surveillance. And despite all the safeguards put in place to avoid physical interaction, the killer's latest victim turns out to have been in contact with three young girls: Tsuzki Mio, a certified prodigy; Matsuno Hatsuki, a quiet but opinionated classmate; and Kouno Ayumi, her best friend. And as the girls get caught up in trying to quell curiosity under such terrorist scrutiny, Hatsuki learns that there is much more than meets the eye of their monitored communications.

独自一人在城堡中弹奏钢琴的神秘存在，Deemo。有一天，一个失去记忆的小女孩从天而降，城堡中不可思议的居民、借由钢琴旋律成长的树木、失去记忆的小女孩以及Deemo，编织出一个充满温柔、梦幻、凄美与爱的故事。全世界玩家所喜爱的音乐游戏，Deemo的剧场版动画正式决定制作。

女子高中生音无小夜（喜多村英梨 配音）有一个幸福的家庭和一群善良的朋友，虽然丧失了一年之前的全部记忆，但这并不妨害她享受眼前的快乐时光。在这个世界中，出现了一种名叫“翼手”的怪物，它们拥有永恒的生命，以鲜血为食，现在，这些怪物的存在逐渐威胁到了人类的安全。表面上来看，小 夜和这些可怕的怪物似乎一辈子都不会有所交集，但在2005年的这一天，当那个漆黑的不详男子出现在小夜的面前时，一切都改变了。男子名叫哈吉（小西克辛 配音），他的到来不仅改变了小夜的命运，也唤起了小夜丢失已久的回忆。
为了保护世界和所爱的人，小夜拿起了武器，在哈吉的帮助下开始了同翼手的战斗。