Let's just get this out of the way up front. This game ♥♥♥♥♥♥♥ sucks.

The combat that is ostensibly the whole point of the game is shallow, wildly inconsistent, and borderline incoherent. Some characters are laughably overpowered to the point of trivialzing any sense of difficulty (e.g. Imu and her magical stunlocking stick of boobie ninja beatdown) while other characters are profoundly useless until you level them up by repeatedly failing missions. Mercifully, this "grind" is quick so you won't sink much time into a character fruitlessly. Mechanics like juggling are temperamental at best, and the "clothing damage" cut-away doesn't seem to pause the action sometimes which makes maintaining momentum a crapshoot. Some bosses can be steamrolled in 20 seconds with little strategy or effort, while others seem intermittently able to pull off amazing split second recoveries and infinite combos, which leads to frustrating fights.

There's not a lot of content here either, a limited number of enemy types and arenas mean the story is a collection of slightly different permutations of arena and boss.

But the ultimate truth behind this is none of that matters. You don't play this game for deep emergent gameplay. You play it for the tiddies and because Ryōna pushes all your degenerate S buttons and you can put a collar on her.
Forget I said that. These ninjas are the purest maidens. Except for Katsuragi, who is a habitual molester. And Haruka, who has canonically engaged in forced intercourse. And Ryōbi (no relation to the power tools) who is into some kind of breast inflation thing. Okay, maybe they're all degenerates too. Seems like most of them are hard gay for each other as well.

I can't seem to fathom why I keep playing this game as opposed to just browsing the Senran Kagura tag on danbooru. Perhaps it is because I am a piece of ♥♥♥♥.