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.
Through a coincidence Tozaki runs into Kurata, his first crush from high school. They begin a relationship, but Kurata's jealousy starts causing problems.
IT guy meets corporate golden boy. They can’t stand each other—until they maybe can’t stop thinking about each other.
