a bit random PLS READ TILL THE END

there was this anime i remember watching when i was younger but i cannot remember the name for the life of me and it seems like such a fever dream the anime was like late 2000s early 2010s

basically the mc had a crush on her teacher (bare w me its not creepy) but this teacher was like some magical king from another dimension and came to earth to find a remedy for his sick wife who lives in said other dimension (shes the queen obvs)

this whole show was more or less finding the remedy for this queen and along the way she (mc) fights bad guys and one of the villains end up switching teams and joining the good side (basically joins mc's team) with mc her childhood boy bsf and the teacher

all i remember was in the last ep they find out the remedy is this flower (??) thats inside the mc and she basically sacrifices herself and her last wish to the teacher king thing was to make all her loved ones forget abt her so her death doesnt effect them and they dont question her death. the villain turned good used to call her like this silly nickname and in this scene hes like begging her not to do it and pleads her w her actual name. mcs like wow u actually said my name and he's all like i'll call u whatever u want just stay. the guy bsf like crying telling her not to do it blah blah blah

she eventually dies a painless death due to the magic of the king teacher giving he a painless death but the last last scene was her opening her eyes and being like "im alive?" and then like roll the end clips lol

IK THIS WAS SUPER LONG BUT IF SOMEONE HELPS ME I WILL FOREVER BE GREATFULLLL!!! EVERYONE KEEPS SAYING THE PLOT SOUNDS SIMILIAR TO CARD CAPTURE SAKURA BUT IK IN MY HEART IT ISNTTT