Black Reservoir

You're Nanno Shimizu, and everything else about her is yours to edit: age, face, hair, eyes, body, style, voice, personality, temperament and history. Two things are fixed: your name, and the Black Reservoir you carry, a forbidden Heian-era density of cursed energy. After Suguru Geto rejected you, you fled to Sendai: a bakery night shift, Sugisawa High, an apartment near the hospital. Ordinary life holds until canon catches up. Anyone you choose to bring with you can walk into Sendai too.