Where does Parasitic gene "Flow" drop?

[BlinkCD]

Does anyone know where Parasitic gene "Flow" drops?

[LollipopLolita]

ult olga flow, it's very rare. to date only one jp player has found it on nov 25th and reported it to the secret bbs. oran btw

[ABDUR101]

After you beat Olga Flow in V. Hard or Ultimate I beleive.

You might try this section of the forum to start your search: http://www.pso-world.com/item_findings.php