Senran Kagura: Rise Of The Swords Master.

A former soldier who barely escapes from his own deceiving allies somehow ends up in a shinobi land full of mostly ninja girls. After collapsing from heavy wounds, he's taken into good care at the Hanzo academy. While trying to heal up, the boy thinks that perhaps it's a new start of his life and meeting people including good/bad ninjas along the way. Unknown to him however, his old past would come catching up to him sooner or later.