Now this one is intriguing. I'm not sure whether its supposed to be cute though or rather disturbing considering your mentoring two little girls. The fact that a VN and a game are put together is always a interesting thing as the actual "gameplay" keeps you from getting bored of constant dialogue.

Story
Welcome to Stella Mundo, a magical world still recovering from the devastation of the Mage War that ended the Age of Towers.
Domino, the youngest wizard ever to earn the rank of Archmage, has just begun his study of the ancient Dark Tower, a treasure trove of lost magical knowledge.

But there’s a catch.

As its price for allowing him access to the tower, the corrupt Council of Archmagi has assigned Domino two gifted but troublesome students - Aria, the daughter of a noble family, and Kaya, an orphan with an unusual heritage - and given him just three years to complete their training, a process that normally takes decades.
Gameplay
As Domino, you must mentor Aria and Kaya in their training to become witches, mastering the magical arts. Take them to the classroom to grow the skills required to master powerful spells. Send them on quests to test their progress and show them the dangers that exist in the world. And mentor them in the value of friendship, a mage's strongest asset.

On your adventure you'll encounter dragons, assassins, fairy queens, elvish hunters, warrior angels, and many ferocious creatures. However, the most dangerous could be yourself...

Become a Teacher of Magic
Instruct your students in the art of magic. Through your techniques lesson combinations, your students will learn in different ways, developing their skills as you direct. With enough time in the classroom, your students will be able to acquire new spells, each with unique powers and chances to unlock special paths in the game's story.

Embark on Quests
The classroom isn't the only place where your students can learn. Instruct them to go on quests to unlock their potential and find out able the wonders, and dangers, of the world. As their teacher you refuse to let your student go on dangerous quests beyond their skill level, so you must keep them learning so they can tackle more difficult adventures.

Story-Focused Gameplay
30+ hours of story, voiced in Japanese and subtitled English
300+ CGs by famed illustrator Ashito Oyari
100 spells to learn
79 quests to complete
20 endings to unlock
3 bonus add-on stories to enjoy