Nande koko ni sensei ga!?

About Nande koko ni sensei ga!? Manga:

17-year old Ichiro Sato is about as average as a student can get… except for his above-average ability to land himself in totally awkward, intensely risqué situations with his no-nonsense teacher, Kana Kojima! Ichiro has his hands full dealing with these steamy shenanigans and unexpected encounters in the most unlikely places. At least it can’t get any worse, right?

The four Golden Times one-shot prequels are included formally as Chapters 1-4 of Nande koko ni sensei ga!? in the Volume 01 Tankobon. The series continuation begins at Chapter 5. Later chapters and volumes follow the relationships of new student-teacher couples, most of whom, have associated with Ichirou and Kana in some shape or form.