Mitsuki and Yuya become stepsister and stepbrother because of their parents' marriage. Mitsuki can't get along with her new family and Yuya doesn't know how to approach his new stepsister. One day, Mitsuki becomes possessed by the spirit of Hiyori. Hiyori likes Yuya and believes Yuya can help her get to heaven. Hiyori places a leather chastity belt upon on Mitsuki and a plan takes place to help send Hiyori to heaven.
Recently, My Sister is Unusual , also known as ImoCho (妹ちょ。), is a Japanese manga series by Mari Matsuzawa, serialized in Fujimi Shobo's Monthly Dragon Age since November 9, 2010. An anime television series premiered in Japan in January 2014. It was adapted into a light novel written by Kougetsu Mikazuki, which was published on January 18, 2014 under Fujimi Shobo's Fujimi Fantasia Bunko imprint. A live action film adaptation premiered on May 17, 2014.
