Your cool and beloved kouhai gets impregnated by a delinquent sleaze in your year. After 2 weeks of sexual relations, she ends up agreeing to become his lover.
Arisa always makes fun of me, a nerdy cherry boy. While she treats my d*ck in return for the chores I did, she gradually starts to get a thing for my d*ck.
The young people manifesto the critical counter strategy against the declining birth rate. They integrate 'GETTING PREGNANT' in the mandatory educational curriculum.
In the future, the world is much more open about sex. And to promote the birthing of future generations, sexual is restricted until women are most fertile. When they reach this period, they have a cumming of age ceremony...