For the DLC weapons, you need to copy the .wep files in the "kunoichi_weapon.zip" into the /bundle/ folder in the root game folder
Default location is C:\gyunyu\kunoichi\bundle\
It adds two weapons for each girl into the game - a 100g joke weapon, and an 8000g special weapon
Unity Player [version: Unity 4.3.1f1_cebd4d9b5122]
Unknown caused an Access Violation (0xc0000005)
in module Unknown at 001b:003ce258.
Error occurred at 2014-05-25_151244.
H:\TS1\くのいちが如く\kunoichi.exe, run by Administrador.
17% memory in use.
3199 MB physical memory [2636 MB free].
0 MB paging file [0 MB free].
2048 MB user address space [1945 MB free].
Write to location 003ce258 caused an access violation.