Senran Kagura Shinovi Versus' official site features a splash page with a topless Senran Kagura character surrounded by swords, which obscure her nipples. There's highly suggestive scroll action, too.
According to Japanese site Otaku, the flash actually contains a completely topless version of the image (below, Kotaku Fish added) buried in the cache. Add that highly suggestive scroll motion, and you have something that looks kinda pornographic!
Senran Kagura: Shinovi Versus -Shinobitachi no Shoumei (rough translation: Young Girls' Proof) was one of the big Vita games Sony showed at its pre-Tokyo Game Show press conference, and it will be getting an anime in Japan next year—more clothes, too, hopefully!
PSV「閃乱カグラ」公式を解析すると乳首とパ●ズリが拝めるｗｗｗｗ [オタク NSFW]