Fukushuu no Jikan

The main character "Kotoha" was born into a wealthy family and raised without inconvenience. However, her life changes drastically when her half-brother's daughter, Ageha, comes into her life. Ageha deceives everyone around her and tries to take over the protagonist's life. The father, unable to see through her true nature, treats the protagonist coldly. He loses his friends, fiancée, and even his position. "I'm going to knock Ageha down to the ground!" Kotoha, deprived of everything, vows revenge. From now on, she herself will take away everything from Ageha...