Lady Blue

At 19 years old, half-demon ninja Miko Mido — heir to the Miroku clan and college student — is just trying to fall in love for the first time, which is already complicated enough without a supernatural predator showing up. A mysterious female ghost starts draining the life-force from her schoolmates, and when Miko realizes the phantom has also noticed her love interest, the situation becomes personal fast. What starts as a school-set mystery pulls you into a layered world of ninja clan mythology, demonic realms, and supernatural horror that actually has some weight to it. The 4-episode OVA format keeps things tight, and the mythology around the Miroku clan gives the story more texture than you might expect going in. Arms Studio leans into the blend of horror and eroticism in a way that feels deliberately crafted rather than incidental — the supernatural tension and the mature content feed into each other rather than sitting awkwardly side by side. If you've already worked through Urotsukidōji: Legend of the Overfiend or Demon Beast Invasion and want something with a similar mid-90s dark supernatural energy, this fits that space. It's from the same era and the same creative DNA, adapted from manga with a clear sense of its own tone. Don't expect it to be subtle — it isn't — but the mythology gives it a backbone that holds the episodes together.