DDD (Decoration Disorder Disconnection)
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Decoration Disorder Disconnection is a mystery novel written by Nasu Kinoko and published irregularly on Faust magazine.
Plot
Arika Ishizue lost his left arm in the A-syndrome related accident and hospitalized. After he left the hospital and went back to Shikura, he met a beautiful boy named Kaie Karyou who has no limbs and is living in a dark basement. The boy asked him to exorcise the "Demons" possessing A-Syndrome patients. Arika was involved in the bizarre cases and the fights with the "Demons".
Source: Type-Moon Wikia
Download:
Vol 1 http://sh.st/Q8co1
Vol 2 http://gestyy.com/wNTYr2
thanks for vol1 Go-Sick-dono
found Vol2 PDF here http://forums.nrvnqsr.com/showthread.php/2637-DDD?p=2845250&viewfull=1#post2845250
Vol 2 added~