Vertical short drama

The Academy's Janitor Is the Last Star-Sealer

They call her Rank Zero.

At an elite magic academy that ranks every student by the colour of their mana, the night janitor everyone mocks as "Rank Zero" is secretly the last Star-Sealer — and when the school's prodigy cracks the forbidden seal beneath the clock tower, she has until the midnight bell to close it before anyone sees what she is.