Senran Kagura is a show that is based off a popular visual novel series. If you want to cover costs these days from your games or books, you create an anime and vice versa.
As you know, ninjas are as big part of Japanese culture, they even have a ninja restaurant. Most ninjas were used for missions, espionage, assassinations and other random jobs. Times may have changed but the need for ninjas hasn’t. This is where the girls of Hanzo National Academy come in. They’re being trained as “the good ninjas” to protect the citizens from “evil ninjas” like the girls of Hebijo Clandestine Girls Academy and to protect one of the 2 secret scrolls which contain a super secret ninja technique.
Your ninjas-in-training are Asuka who is the grandaughter of the great ninja Hanzo (yes the same one the school is named after), Katsuragi who is a perverted girl and provides most of the ecchi moments with breast grabs and her uniform which she wears the top open, Hibari is the really cute clutzy one who may be weak but has hidden skill, Ikaruga the straight forward, disciplinary type, and Yagyuu probably the most skilled of the bunch and she plays Hibari’s protector, the two are like sisters. Each one has their time to shine and they play well off each other.
The show is put together well from opening to end. The narrator is kind of funny and obliterates the 4th wall. He actually says “shit’s about to go down”, and then he has his breast jokes like “ridicuboobs”. They meshed everything together without missing a beat and the show isn’t afraid to make fun of itself. Could have lived without the futomaki rolls almost every episode though.
Some similar shows would be Sekirei, Sekirei: Pure Engagement, Ninja Nonsense, Freezing, Freezing Vibrations, Hyakka Ryoran: Samurai Girls, Oh! Samurai Girls. These shows are very similar with amply endowed girls/women fighting to protect something or someone and in the case of Freezing, to protect the world. Think of this like TMNT with females, you have the same sort of dynamic between the girls. If you want a simple action, ecchi with a few laughs then this show is for you.