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.
The diligent, shy and highly anticipated Kotoko. This girl burdened by stress, has a "strange habit". That is, whenever she realizes someone is looking at her lewdly, she... [RPG]
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...