Mature content warning. This manga may contains some content which is for mature audiences only.
Adamasu no Majotachi
Yukinari discovers that he has a condition known as Adamas Syndrome, which allows him to ejaculate rose diamonds worth 5 million yen. One side effect is that each ejaculation causes him to lose 1 year of lifespan. A group of seductress women called "witches" are now seeking his semen to get rich.