Ginga Ojousama Densetsu Yuna: Kanashimi no Siren

Galaxy Fraulein Yuna OVA 1

Galaxy Fraulein Yuna: Siren's Sadness

Ginga Ojou-sama Densetsu Yuna

Sorrowful Saline

銀河お嬢様伝説ユナ ~哀しみのセイレーン~

Yuna Kagurazaka won the interstellar Galaxy Fraulein contest to become the Guardian of the Light. After defeating several threats to galactic peace (As seen in the PC Engine games), old enemies have framed Yuna for attacking and demolishing her hometown. Yuna's friends now must attempt to rescue her from her pending execution, with comedic results.

(Source: ANN)