Ancient Magic Hunters

Seni Lemeni is a powerful sorcerer at Dragon Tail Magic Academy. She is filled with delusions, thinking she would be the next Grand Wizard because of her immense power, despite being okay-ish. Throuhg a book given to her by the current Grand Wizard, she finds out that mana levels has been decreasing. Eventually mana could go away completely leaving her without magic. She finds out that long ago, during the Hundred Years War, mana level were actually going up, not only that but it was at it's peak. She figured there was something in that period that helped mana to go up. So she made plans to go back in time to find the source that caused mana to rise to prevent mana from going extinct.