BING BING BING! You are correct! Though they don't look very similar they are ninjas with the varying name of 'Sheena/Shihna'Shiina'. Besides it's not a 'curse', it's more of a coincidence thing. She just stands on the wrong place during the wrong time. Besides... both of them are epic when they blush.
Add another parody on the long list of. But damn this show is awesome. Detective Prince Naoi Ayato is on the job! Student Council President Naoto Shiroga... wait. Am I doing this wrong?
Anyway sorry for my parodying. disregard it