The Magical Revolution of the Reincarnated Princess and the Genius Young Lady, Vol. 4 (manga) — Piero Karasu

Cursed by a dragon and entrusted with its knowledge, Anisphia wishes to use the ancient creature's wisdom to take her magicology to another level. In order to do that, she'll need the help of an eccentric friend and co-researcher: the infamous Tilty Claret. But after enlisting Tilty's and Euphyllia's help with her most dangerous experiment to date, there remains another enigma for Anisphia to unravel -- the true nature of the mysterious Lainie Cyan!