Population in japan is declining so the government has made it mandatory for high school girls to be impregnated by their male classmates. Everyone thought it was a hoax at first but the government is very serious about it. 'War is looming and japan needs men to compete with the rest of the world,' the emperor has decreed.

The teachers will pair up the boys and girls in a way that'll maximize the chances of the babies having traits desirable by the japanese government so the girls can be paired with boys they hate or vice versa. The couplings will happen in the classroom and be observed by teachers to make sure that the girls are being creampied properly.

You live in a small town called Sotoba in the Gifu prefecture. There are 24 students in your class, 12 of them boys and 12 of them girls. Some of the girls have boyfriends so they are very worried about being paired with someone else. Most of the boys without girlfriends are looking forward to being paired with the popular girls.

You don't have a girlfriend either so you don't really know who you want to be paired with. Also you're a virgin so this will be your first time having sex.

'Alright class, here's the list of breeding pairs,' says Kawahara Yukiko-san. She's your homeroom teacher and a very sexy woman in her mid-20s. Plenty of boys in your class would rather have sex with her than any of your classmates but alas, teachers aren't part of the breeding pool.

She opens an envelope and takes out two papers, 'the class will be divided into two breeding groups. Group A and group B. Each group will have 6 boys and 6 girls. Group A will have mating sessions on Monday and Wednesday, Group B on Tuesday and Thursday. We'll have a combined session on Friday. I'll announce the names now.'

You wait with bated breath to hear your name.