Revenge on my arrogant sister: I gave her a 100x concentrated aphrodisiac, turning her into a trembling submissive mess.

As the sole breadwinner of the household, Kamiki Rei is effectively the “King of the house,” while her brother Yuta is nothing more than a bum. Fate takes a turn when an opportunity for revenge falls into the brother’s lap… courtesy of a friend who asks him to hold onto some goods for a while… Only problem is that he ends up overdoing it.