If Kochoshi (the first son of the emperor), Kochoson (grandchild of the emperor) or any other descendants of Kochoshi do not exist, the "Kojishi" (the second son of the emperor) and his descendants will be authorized as the imperial heirs, based on the order of the right of succession to the Imperial Throne.
皇長子（天皇の長男）や皇長孫（天皇の孫）、その他の皇長子の子孫のいずれもいない場合、皇位継承権の順位にもとづいて、皇次子（天皇の次男）及びその子孫が皇嗣となる。