Reborn… The first world is Hunter x Hunter. Unexpectedly, the first character encountered is… Chrollo Lucilfer, who is known for being a pervert, madman, and fruit farmer! Luckily, there is an AI system acting as an intelligent assistant. The protagonist declares: "No matter who you are, as an all-knowing time traveler, I will let you witness the ultimate development of Nen… and how to make the most of your abilities!" Classmates, put away your books, the teacher is about to… start the lesson!