Naraku killed Inuyasha and raped Kagome, Kagome realized that really all this time she was just being a bitch because she wanted to get fucked, and apparently, this was Naraku's grand goal. Sango had sex with Kohaku and is now rebuilding the clan with extra-retard babies. Miroku disappeared when he tried using his wind tunnel to masturbate. Shippo was killed by Kagome.
Kagome became her own great^100 grandmother, making her able to successfully fend off the giant brains that tried to take over the world.
The last page of the manga is a photograph of Rumiko Takahashi being stuffed with copies of the last Ranma volume while being violently raped. The End.