they already are born in an ancient family of assassins who basically have a entire a lineage of doing this stuff and hefty funds as a result . they don't need pensions , they millionaires already bruh .
lisa's most notable (and only) accomplishment in life was getting killed. ayane and kasumi are paid sisters, with established careers and have accomplished bigger and better things than lisa ever could. not to mention they were there when she got killed... so........