After Going to the Human World, She Became a Yandere

It was clearly four children fighting wits and courage with the Queen. One became the Demon Lord, one became the Demon Emperor, and one became the Ghost King. As for the other one, it seemed that he had not changed. They have a father who is a heavenly emperor and a mother who is a human emperor, but so what. The upright eldest brother in the past has become a demon king who does all evil, the kind-hearted second brother has become a ruthless demon emperor, and the clean and harmless third brother has become a cruel and bloody ghost king. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.