Summary of this verse
Senran Kagura is a video game series developed by Tamsoft and produced by Marvelous Entertainment. The franchise revolves around groups of female ninjas, and has received several manga adaptations. The main series are primarily a story focused side scrolling beat-em up with the Versus games as fanservice heavy arena brawlers, both share the common gimmick of dealing damage to your opponents until their clothing are fully torn. There are occasionally spinoffs like the cooking rhythm game Bon Appetit or the multiplayer shooter Peach Beach Splash.
The plot normally consists of ninja academies that teach their young students the ways of good shinobi and evil shinobi, which result in some wars or conflicting morals at times. Most of the series center around the good shinobi from Hanzo Academy and their interactions with the other shinobi from Hebijo, Gessen, Overseers of the Festival, and the Crimson Squad. Sometimes they do face threats not associated with either academies like Dogen, the powerful Yoma demons, and even Kagura.
Power of the verse
The verse isn't that powerful, but far from weak. Most of the high and low tiers stack up to Large Building level with Supersonic speeds as powerful shinobi. There are some hax with select ninjutsu (Size Manipulation, Darkness Manipulation, Toon Force, Summoning etc) or the Shinobi Barriers, which allows the user to create a semi-permanent dimension where they can freely fight without being seen by civilians. The Yoma also share a similar ability, but it has a more sinister air to it and non-combatants aren't safe from them.
Speaking of the Yoma, they are destructive parasitic beings than can create other beings (or transform those that ingest them) and are born from the blood shedded within a shinobi's barrier. They are consistently described as a major threat to large populations. Kagura is a high tier character that was made for the purpose of eradicating these beings and consuming the Red Orbs from them. She is capable of freely manipulating space (even flipping the world), tearing rifts in reality, or easily destroying Kyoto when she reseals herself after enough Red Orb consumption. This easily bumps the verse up to City level because of her existence alone.
Supporters and Opponents of the Series
Hebijo Clandestine Girls' Academy
Hessen Girls' Academy
Overseers of the Festival