The Ninja-Thon Collection
Tsubame is a kunoichi, a female ninja. The lord she serves under, Kuniyoshi, is faced with a threat to his dynasty. One of his wives seeks to off him and install her son as the new lord. To prevent this, Kuniyoshi must produce a true heir, but he is no longer able to leave the castle, and it is too dangerous for his mistress to come to him. Lucky, Tsubame has a special skill, unique to Kunoichi; the ability to store a man’s ‘seed’ in her womb for up to seven day, before transferring it to another woman.
If that plot synopsis bothers you in any way, do not read on.