Kara no Kyōkai (空の境界, lit. Boundary of Emptiness) is a Japanese novel series, authored by Kinoko Nasu (Tsukihime, Fate/stay night, Fate/Hollow Ataraxia) and illustrated by Takashi Takeuchi (Tsukihime, Fate/stay night). It is also known under the nickname Rakkyo (らっきょ ). Its subtitle is The Garden of Sinners.
Summary: Mikiya Kokuto finds himself intrigued by two things. The first is by Shiki Ryougi a beautiful, yet rather unsociable, girl and the other is the strange series of violent deaths that start occuring in his town. As he attempts to get closer to Shiki, he soon learns that the two are connected and that there are many supernatural forces at work which could very likely get him killed as well.
Movies:
Movie 1: Overlooking View (俯瞰風景 - Thanatos)
Movie 2: Murder Speculation (Part 1) (殺人考察(前 ) - ...and nothing heart)
Movie 3: Remaining Sense of Pain (痛覚残留 - ever cry, never life)
Movie 4: The Hollow (伽藍の洞 - garan-no-dou)
Movie 5: Paradox Spiral (矛盾螺旋 - Paradox Paradigm)
Movie 6: Oblivion Recorder (忘却録音 - Fairy Tale)
Movie 7: Murder Speculation (part 2)
(source: Wikipedia, ANN)