Four Billion Nightsフォービリオンナイツ ~久正人傑作短編集~ ; Happy Arbor Day! Four Billion Nights ; 4000000000 Nights ; Aru Adauchi no Hanashi ; Kamaitachi no Hi ; Hisa Masato Kessaku Tanpenshuu

A collection of Hisa Masato's previous oneshots. It includes: 1. Four Billion Nights Troubled by a strange case, police officer Sasaki seeks the aid of the "pruning section," a special police division that deals with the unusual and unnatural. 2. Aru Adauchi no Hanashi A woman seeks revenge on a crime lord for an assassination he ordered. 3. Kamaitachi no Hi Mura Shigeki, a police detective, is reassigned to special investigations and must work with a youkai partner to track down a serial killer before he kills again.