We Never Learn

After school as usual, Naruyuki is tutoring Fumino in the library. Suddenly, a famous detective from a different era appears...? 

(Source: Shonen Jump Plus, translated)

Having lost his father, Yuiga Nariyuki lives a simple and modest life. While working to attain the ‘Special VIP nomination’ for a college, he became the private tutor of the three geniuses of Ichinose Academy: Rizu, Fumino, and Uruka!

This time around, however, mysterious happenings start to come down on Yuiga and the others...?!  
One moment it's a fantasy, next it's a historical play, then getting smaller, or maybe getting bigger even?!  
But no matter what happens, the heroines' love will not waver!  
What development awaits us...?

This is a short-story collection consisting of two volumes.