Títulos Alternativos: FR: Peine perdue -Happy birthday- | US: Wasted Effort: Happy Birthday | DE: Vergebene Liebesmüh – Happy Birthday | CN: 挥棒落空 | JP: 掉棒打星-Happy birthday- | TW: 揮棒落空-Happy birthday- | MAL: Ookami Shoujo to Kuro Ouji | ALT: Ookami Shoujo to Kuroouji | ALT/EN/MAL: Wolf Girl & Black Prince | JA: オオカミ少女と黒王子 | MAL: Ookami Shoujo to Kuro Ouji: Wolf Girl & Black Prince | MAL: Wolf Girl and Black Prince