A Changed World

The sons of a demon and an angel, their father was a powerful figure of the Demon Realm. He fell in love with someone he shouldn't have, and was left missing, fate unknown, after the Seven Demon Lords joined forces with the Seven Wings of Light of the angels. Their mother, meanwhile, was assassinated by a killer sent by the Demon Realm.

After this, the protagonist realized how inadequate his own strength was, but he never forgot the responsibility he carried for his older brother. With help from his father's subordinates, he transmigrates across worlds in search of power.

His younger brother, however, stays home alone, consumed by guilt and rebellion, until he finally comes to his senses.

Will the protagonist, on his path of revenge, face off against his younger brother? There is a harem and a few little perks.

This novel and its characters are purely fictional. Any resemblance is purely coincidental. Do not imitate.