Zero Time(Darkness or Eternity)

A boy name Raku and his sister silica who is 2 year younger than Raku... There parents died in mysterious accident. No one talking about how there parents died, like that accident never happen, people treat those sibling like orphan... After there parents death there Aunt transfer both of them another country. After sending them away in another country, one after another died in Ichino family, not a single thing ever show in the TV, no news about there family, they only receive that a letter when a person died and written in that letter was that they have to work hard to become strong and that Raku have to find there other "Duality" Partner... No one knows what is happening... Unknown attack, parents died, a mysterious letter of blank name. And when that unknown attack stop only 3 people left in Ichino family Bloodline, Raku, Silica, And his Aunt. After 8 year later, Aunt tells them come to your hometown and join the best collage here because there is no better education... And in this world Knowledge is everything. Now after 8 yrs they come back there hometown... Solving his parents mysterious death, opening new mystry.759 yrs of history made by Ichino family... Once again making the History in the world.