fixed book_jacket helper
fixed book_jacket helper

next-l/enju_leaf,next-l/enju_leaf,MiraitSystems/enju_trunk,MiraitSystems/enju_trunk,MiraitSystems/enju_trunk,MiraitSystems/enju_trunk,next-l/enju_leaf,MiraitSystems/enju_trunk,MiraitSystems/enju_trunk