HELP

there’s this bl manga and idk what’s it’s called plz help


it’s where it’s a school and everyone has a spirit(?) the mc and ml have opposite spirits, one has a fire spirit and the other has a water spirit. Both r rlly strong and are the top of the school(?)
they met during childhood bc the fire one called the water one a mermaid or smthn and then the water one wanted to find him bc the fire one ran off..

when they use their spirit thingy their appearance changes and the fire’s hair changes color and the water’s hair grows longer I think.. pls help