I Could Never Be a Succubus! Volume 7

Having awakened to the powers of a fallen angel, Liz begins her intense training under the most powerful fallen angel in history—Lilith. However, behind Lilith’s angelic smile lies a hellish spirit, and Liz now finds herself facing trials that put off even humanity’s strongest. As Liz grows, the training only escalates, and before long, she is thrown into an ultra-high-difficulty SSS+ ranked dungeon to rack up some combat experience. But in the midst of it all, something happens that no one could have expected. Deep in the depths of the dungeons, Liz and her comrades make a shocking discovery as a new pathway opens up before them: the gateway to Hell.

[From J-Novel Club]