An erotic manga set in a world where practical sex lessons have been incorporated into compulsory education as a countermeasure to the falling birthrate. The protagonist has lots and lots of sex with his classmates and the sex-ed teacher.
Kuragano is a plain girl that's always studied at the same school as me. Truth be told, we have a secret relationship where she lets me fondle her breasts. While I may not be her boyfriend or anything, I don't want her to be taken by anyone...
One night, you were on your way home from work when you met a runaway. With no place to stay, you thought one night would be fine... but the wheels of fate began to go haywire, leading to a life of endless banging.
An S-class adventurer (you) gets violated by two legendary succubi and their two clones (4 slutty succubi in total). Experience the "Square Illusion" of receiving attention from all 4 directions at the same time! You are... just food to them...
The only male student at at certain girls only academy exists solely for the purpose of a certain committee. That is, to be a boytoy serving all the high-class girls wishing to relieve their pent up sexual desires!
A pickpocket living in a small hut comes across a woman lying on the roadside. It would seem the woman is a "Domesticated Succubus" that has been modified so that she can be of no harm to any human... That is, a very valuable sex sl*ve.