Mokke

Mokke (もっけ) is a Japanese manga series written and illustrated by manga author Takatoshi Kumakura. The manga was first serialized in the Japanese seinen manga magazine Afternoon Season Zoukan on August 2000. The magazine was suspended after its 14th issue, and the manga continued its serialization from the March 2003 issue of Afternoon magazine. An anime adaptation by Madhouse and Tezuka Productions started its broadcast run in October 2007.

メクラベ "Mekurabe" (Episode 19)
Mizuki who fractured her bones during judo training encountered a skull who promise to train her to be stronger. She ended up getting possessed by the skull and choke her big sister. Eventually Mizuki managed to shake off the possession.