Birdy the Mighty Decode: The Cipher(2009)

Tetsuwan Birdy DECODE: THE CIPHER

This OVA connects the first and second Tetsuwan Birdy DECODE seasons.

Birdy uses her pin-up alter ego to help Tsutomu make a love connection with Sayaka, but everything goes horribly wrong when a Federation marionette is added to the equation!

(Source: FUNimation)