I opened my eyes, and someone smiled as they told me she was dead.
--My classmate is dead. Who killed her?
A life lasts no more than thirty thousand days, yet I have never left those twelve years.
A medium-to-long story, probably not serialized behind a paywall. A futuristic school mystery with sci-fi elements, no romance, a high school girl as the protagonist, and an unconventional theme.
Theme: You killed her. Not you. Us.