'Who Made This Stupid Rule That Stepbrothers & Stepsisters Shouldn't Be Allowed To Marry.' This Big Stepsister Loves Her Little Stepbrother Too Much

Zoey is a talented dancer whose organized life is rudely disrupted when she moves in with her new step-dad and three step-brothers, until she discovers a dog-training app that can get boys to obey her every command. But she soon learns that it isn't the cure-all she had hoped for.

The star of a team of teenage crime fighters falls for the alluring villainess she must bring to justice.

Noel struggles to accept his father's remarriage to Agnes and the arrival of his step-sister, Melody. The two grow up harboring a bitter hatred for each other. When their parents die, Noel becomes Melody's legal guardian, much to her dismay. Later, each now married, the two become business partners and eventually grow closer.

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.

Young Haru rescues a cat from being run over, but soon learns it's no ordinary feline; it happens to be the Prince of the Cats.