Wind Shinobi Fuuka

"Eh?
What do you mean that Shihon-chan might die?
Eeh? Shihon-chan's head has gone missing?"
It seems Shihon-chan's headless body was found in the meditation room.
A murder isn't unusual, after all, there's at least one bloodthirsty killer at school.
Murdering people is fine and all but it's considered a taboo that must be never violated to decapitate and hide their head because one can never be revived if so.
If her head isn't found within two days, she'll really kick the bucket!
A boarding system school isolated from the outside world, and there do the immortal girls live.
The time it takes for them to become an adult is the same time it takes for them to deage and become a baby, they grow up until they become an adult once more and then do they deage again⁠—a cycle that's being repeated.
There's only one condition in order to graduate from school: one needed to be deemed a prodigy by someone observing from the outside. The moment that verdict be handed down, the girl's graduation would be recognized and she would disappear from school.
The immortal girls' peaceful school life would be greatly disturbed by a certain murder case.

Moby, an apprentice magician, is a girl traveling toward the town of Ildarnah, where the Adventurers’ Guild is located, in order to become an adventurer.
One day, with just a few days left before reaching Ildarnah, Moby hears rumors of a strange phenomenon on Corndree Island, known as the “Harbor of Waiting Winds.”
This phenomenon, called the “Great Calm,” occurs for five specific days each year, when the island suddenly loses all wind.
And this year’s “Great Calm Days” begin tomorrow.
Driven by curiosity, Moby decides to spend the five windless days on Corndree.
In the windless town, she encounters three girls.
And around them unfold numerous erotic incidents…

Our protagonist, Kujo Rikune, graduated from ninja school at the top of his class and is an excellent ninja. He is still a genin.
He has a serious but laid-back personality. However, he can also be strict and cold-hearted when it comes to enemies he must defeat.
He visits Kirigami Village after receiving a request to exterminate a “demon” that is emitting mist.
However, the villagers are somewhat distant, and it feels as though the village harbors some kind of secret…

“Kanna~, give me a hand for a bit, will you?”
“Aoi? It’s rare to see you this early in the morning. What’s going on?”
“Well… it turns out our village somehow got taken over by faceless creatures.”
“Huh!? Isn’t the only airhead around here you??”
“Hey, that’s mean! But seriously, it felt like they were strangely efficient about it…”
“I was bored today anyway, so this works out perfectly!
I’ve been itching for some action—let’s head out right away!!”
And so, the shrine maiden Kanna and the ninja Aoi began their mission to reclaim the ninja village—
unaware that someone had been tailing them all along…

Wind City, an area with a long history that exists on the Mua continent.
As the name implies, lives here come and goes like the wind without a trace, birth, and disappearance, no one cares.
Due to its special geographical location, refugees who have escaped the war have come for many years, so it is also called a refugee area.
Wind City has a diverse and conflicting culture, race, all kinds of chaos, and corruption, which have never ceased for hundreds of years.

Players will unfold the story from Jayne's perspective──
This orphan, who was once born in Wind City, got rid of the poverty-environment by his efforts.
After returning to the Wind City by chance, he met the catgirl who fled as a commodity, Ophelia.