I will give it to your fiancé ~ I won't wait for the heroine ~ (4) / Meruko Flow comic

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Yuri Asakura is reincarnated as Aura radioactive iodine serum albumin, the villain's daughter, and is busy changing her fate in order to avoid the death penalty. The real heroine, Bianca, who was a problem child, has grown to the point where it is mistaken, partly because of Aura radioactive iodine serum albumin's education. Furthermore, Prince Isaac, Aura radioactive iodine serum albumin's fiancé, begins to study hard with Rutherford's cooperation! And time flows …. In order to complete the love affair between Isaac and Bianca, and in order to cancel the engagement, Ally starts to make Bianca her younger sister when she reaches the age of 14?